# Ohmforce — Bohm Multimodal Kick Drum Voice - [Manual PDF](../../manuals/Bohm_Eurorack_Manual_Compiled.pdf) --- [Manual PDF / source](https://bohm-eurorack-manual.readthedocs.io/en/latest/index.html) # Using Bohm to build full-length songs in Eurorack Bohm is not just a kick module in the usual “one trigger in, one thump out” sense. Based on the manual, it is really a **stereo dual-voice kick system** with **multiple drum models**, **performance modes**, and optional **Groove** and **Performer** expanders. That makes it useful as a **structural anchor** for a full track, not just a drum voice. In a Eurorack song-building context, that matters a lot: the kick often defines **section changes, energy levels, drops, transitions, arrangement cues, and sidechain behavior**. Bohm seems designed to help with exactly that. --- ## What Bohm brings to song creation From the manual, the important features for arrangement are: - **Stereo dual-voice kick architecture** - **Multiple kick “models”** with different behavior - Controls for: - HIT - VELOCITY - LENGTH - SUSTAIN - ATTACK - PITCH - CURVE - TRS DECAY - COLOR - FX - TRS TONE - **Groove expander** for: - secondary kick voice - techno rumbles - layered percussion - **Performer expander** for: - DJ-style effects - ducking - stereo processing - **Studio / Live Song / Jam modes** That means Bohm can cover several arrangement roles: 1. **Main kick** 2. **Layered low percussion** 3. **Rumble / tail / reverb-style energy bed** 4. **Stereo movement and transitions** 5. **Section-by-section kick program changes** 6. **Mix glue via ducking** For full songs, these are all crucial. --- # The key idea: use Bohm as the arrangement spine A lot of modular patches fail to become songs because everything is equally active all the time. Bohm can help solve that if you think of it as the **arrangement spine**: - Verse: lighter kick model, shorter decay - Pre-chorus/build: more pitch curve, more sustain, more velocity movement - Drop/chorus: heavier model, layered Groove rumble, wider Performer stereo processing - Breakdown: remove main kick, keep only rumble or filtered tail - Outro: simplify to dry kick with less sustain and less FX Instead of making one good kick patch and leaving it static for 8 minutes, use Bohm to create **distinct sections**. --- # Why Bohm is especially good for full songs ## 1. Different models can act like different “drummers” or “machines” The manual says each model represents a different drum-machine architecture, and the controls behave differently depending on the model. That is powerful for arrangement because changing models can create: - classic verse/chorus contrast - old-school vs modern section contrast - tighter club section vs looser breakdown section - dry intimate groove vs huge rave section In practical song terms: - **Intro**: select a simpler, tighter kick model - **Main section**: choose a punchier, fuller model - **Breakdown**: switch to a softer or boomier model with reduced attack - **Final drop**: return to the most aggressive model Even if the melodic content stays the same, these changes make the track feel like it evolves. --- ## 2. The secondary voice from Groove can become your arrangement engine The Groove expander adds a **secondary kick voice** for **techno rumbles and layered percussion**. This is huge for full-length tracks because a second low-frequency rhythmic layer can function as: - a **rumble bus** - an **offbeat bass-percussion layer** - a **transitional texture** - a **chorus energy boost** - a **breakdown tail or ghost pulse** This means Bohm + Groove can support song sections like this: - **Intro**: dry main kick only - **Verse**: add subtle Groove layer every few bars - **Build**: automate Groove decay/tone/color for rising energy - **Drop**: full main kick + Groove rumble - **Breakdown**: mute main kick, keep only filtered Groove tail - **Outro**: remove Groove, leave dry kick again That alone is often enough to turn a loop into a track. --- ## 3. Performer gives you transitions, not just tone Performer adds: - DJ-style effects - ducking - stereo processing This is exactly the kind of thing many modular systems lack when trying to become “song-capable.” A great loop becomes a full track when you have: - transitions - tension/release - mix-space management - controlled widening/narrowing of sections Performer seems designed for that. You can use it for: - **build-ups** with widening or FX emphasis - **drops** by snapping from effected/wide to dry/centered - **breakdowns** with ducking reduced or transformed - **returns** where the kick regains authority in the mix --- # Practical full-song strategies with Bohm ## Strategy 1: Use Bohm programs as section presets The manual mentions memory for **system settings and up to 32 programs**. That suggests one of the best song workflows: Create separate programs for sections such as: 1. Intro 2. Verse A 3. Verse B 4. Build 5. Drop 6. Breakdown 7. Final drop 8. Outro For each program, change things like: - kick model - pitch curve feel - decay/sustain amount - color/tone - FX intensity - Groove layer presence - Performer stereo width or ducking behavior This is one of the cleanest ways to make a modular song feel intentional. ### Example program map - **Program 1 – Intro** - short kick - low sustain - minimal FX - **Program 2 – Main groove** - medium sustain - stronger attack - moderate color - **Program 3 – Build** - brighter tone - longer tail - increased stereo processing - **Program 4 – Drop** - full sustain - heavier model - Groove rumble active - **Program 5 – Breakdown** - softer attack - reduced velocity - tail-heavy or filtered layer - **Program 6 – Final** - strongest hit - widest stereo - aggressive ducking If Live Song Mode allows sequenced kick changes as the manual suggests, this becomes even more powerful. --- ## Strategy 2: Build the song around density, not just note changes In Eurorack, people often focus on changing pitch sequences to make a song. But often what works better is changing **rhythmic density and envelope weight**. Bohm’s controls support that directly: - **LENGTH** and **SUSTAIN**: control how much space the kick occupies - **ATTACK**: changes punch and front-edge definition - **VELOCITY**: changes groove and emphasis - **PITCH** and **CURVE**: shape perceived impact and style - **COLOR / TRS TONE / FX**: define mix placement and character For sections: - **Sparse section** - shorter length - reduced sustain - lower velocity variation - less FX - **Big section** - stronger velocity - longer sustain - more pitch curve snap - more color and stereo emphasis This creates arrangement contrast even if the trigger pattern stays mostly the same. --- ## Strategy 3: Use Bohm to define the drop A full song needs at least one moment where the energy clearly lands. Bohm can make that happen through controlled contrast. ### Build technique Over 8 or 16 bars: - gradually increase: - FX - COLOR - TRS TONE - SUSTAIN - optionally bring in Groove rumble - narrow or remove main kick in the final bar - then reintroduce full, dry, punchy kick at the drop This is a classic dance arrangement trick. ### Modules to pair with - **Sequential switch**: route different CV sources to Bohm section by section - **CV recorder / automation module**: record knob movements for build-ups - **Clock divider / multiplier**: trigger transitions every 8/16/32 bars - **Mute module**: drop the kick briefly before impact - **Filter or EQ module** after Bohm: automate low-pass/high-pass sweeps on the rumble layer --- # Combining Bohm with other modules for complete songs ## 1. With sequencers Bohm becomes much more song-capable when paired with a sequencer that can handle: - pattern chaining - probability - mutes - CV automation - song mode Ideal pairings are modules that can: - send kick triggers - send accent/velocity CV if available in your system - send section-change CV or gates - sequence mutes for Groove and Performer behaviors ### Use cases - Trigger Bohm with a main 4/4 pattern - Use a second sequencer lane for occasional missing kicks in breakdowns - Use another lane to modulate velocity or tone every 8 bars - Chain patterns into a full arrangement If you have a sequencer with song mode, let the sequencer drive: - triggers - resets - section changes - mutes on bass, melody, and hats Then Bohm’s section programs define the drum architecture while the sequencer defines timing. --- ## 2. With bass voice modules The kick and bass relationship is usually the main obstacle in turning a loop into a track. Bohm’s **ducking** via Performer is especially relevant here. ### Good approach Patch: - Bohm as your kick anchor - a separate bass oscillator/filter/VCA chain - use ducking from Performer or an external envelope follower/VCA setup Then design sections like: - **Intro**: kick only, no bass - **Verse**: bass enters on reduced notes - **Drop**: full bass with ducking - **Breakdown**: bass becomes more tonal, kick reduced - **Final drop**: both return, tightly ducked This lets the song breathe. ### Bass modules that work well conceptually Any: - mono synth voice - wavetable bass voice - FM bass voice - acid-style voice - resonant filter ping bass The key is not the module type, but **arrangement discipline**: don’t let bass play the same density in every section. --- ## 3. With melodic voices Bohm helps songs because strong kick arrangement gives melody something to arrange against. Use Bohm section changes to cue melodic changes: - shorter drier kick = melody can be busier - heavier sustained kick = melody should simplify - breakdown kick reduction = melody can expand harmonically - drop kick return = melody should become hook-like and repetitive ### Great patching concept Use one master sequencer or clocked logic system to control: - Bohm triggers - bass sequence variation - melodic transpositions - mute states - effects sends That way the whole patch shifts together in sections. --- ## 4. With clock, logic, and utility modules This is where songs really emerge. ### Useful module types - clock divider - logic - Bernoulli gate / probability router - sequential switch - CV mixer / attenuator - offset generator - sample & hold - precision adder - mute matrix ### Why they matter They let you change Bohm over longer timescales: - every bar - every 4 bars - every 8 bars - every 16 bars Instead of random moment-to-moment variation, you get **structured variation**. ### Example - main trigger every quarter note - every 8 bars, a sequential switch changes Bohm modulation source - every 16 bars, a gate activates Groove layer - every 32 bars, a programmed switch changes to another Bohm preset or mode That is song architecture. --- ## 5. With modulation sources Bohm’s many parameters suggest it benefits from selective modulation rather than constant hands-on tweaking. ### Best modulation targets for song progression - **VELOCITY** for groove evolution - **PITCH/CURVE** for style shift between sections - **SUSTAIN/LENGTH** for energy scaling - **COLOR / TONE** for spectral growth in builds - **FX** for transitions ### Best modulation source types - slow synced LFOs - stepped CV sequencers - envelope followers - random with attenuation - manual CV controller / fader bank - pressure/touch controller for live arrangement ### Important tip Use **small, section-aware modulation**, not constant chaos. For songs, subtle and intentional beats interesting-but-stagnant every time. --- # Song forms Bohm can support well ## 1. Techno arrangement Bohm + Groove is especially suited for this. ### Example form - **0:00–1:00 Intro** - dry kick - hats/noise slowly enter - occasional Groove tail - **1:00–2:00 Main groove** - bass enters - moderate kick sustain - **2:00–2:30 Build** - open hats - more FX/stereo - rising rumble density - **2:30–3:30 Drop** - full kick + rumble + bass - **3:30–4:15 Breakdown** - remove main kick - leave rumble texture and melodic pad - **4:15–5:30 Final drive** - strongest Bohm model - full ducking - wider stereo - **5:30–6:00 Outro** - return to dry kick - elements drop away Bohm’s model changes and dual-voice design map naturally to this. --- ## 2. Electro / IDM arrangement Here the kick can vary more in attack, pitch curve, and timing emphasis. Use: - tighter, shorter models in detailed sections - more dramatic pitch curves in fills - selective Groove layering for odd phrase endings - Performer effects for glitch-style transitions Pair with: - trigger sequencer with pattern memory - probability logic - sample voice for percussion accents - melodic voice with phrase switching --- ## 3. Industrial / EBM arrangement Bohm looks very suitable because **color, tone, attack, and stereo processing** can define aggression. Arrange through: - increasingly distorted or sharpened kick tone per section - secondary voice as pounding low-mid percussion - abrupt mute-based transitions - ducked synth stabs and bass sequences --- ## 4. Ambient / cinematic rhythm tracks Even here Bohm can work if used more texturally. - use softer attack - longer sustain - reduced trigger density - Groove as sub movement rather than obvious rumble - Performer stereo processing for width and space This supports a “slow-blooming” full track rather than club arrangement. --- # A practical patch recipe for making an actual full song Here is a concrete modular setup. ## Core modules - **Bohm** - **Groove expander** - **Performer expander** - master clock - sequencer with pattern chaining/song mode - bass voice - melodic voice - hi-hat / percussion modules - mixer with mutes - filter or EQ - reverb/delay - utility modules for logic, attenuation, switching ## Patch concept ### Bohm - main kick on quarter notes - Groove voice layered only in selected sections - Performer handling ducking/stereo/transition effects ### Bass voice - sequence tied to section changes - ducked against Bohm - simpler in drops, more melodic in breakdowns ### Melody voice - sparse hook in main sections - expanded harmonic content in breakdown ### Percussion - hats and claps increase through arrangement - use mutes to sculpt sections ### Utilities - sequential switch changes modulation destination every 16 bars - clock divider activates fills every 8 bars - manual fader controls FX amount and rumble intensity ## Section plan ### Intro - Bohm only - short decay - no bass - filtered hats slowly fade in ### Verse / Groove A - bass enters - moderate kick sustain - melody absent or very minimal ### Groove B - add clap/percussion - increase velocity variation - subtle Groove rumble ### Build - raise FX and tone brightness - automate longer tails - reduce melodic content - maybe mute kick for half a bar before drop ### Drop - strongest Bohm program - full bass - full ducking - wider stereo image - main hook returns ### Breakdown - remove main kick or shorten it drastically - leave Groove tail or processed sub pulse - melody/pads move to foreground ### Final drop - biggest kick model - highest contrast - additional percussion layers ### Outro - strip back to kick and one texture - return to original dry sound This is a complete track architecture. --- # How to avoid the common “great loop, no song” trap ## Problem 1: everything sounds equally big all the time **Fix with Bohm:** reserve your longest sustain, biggest model, fullest stereo, and strongest rumble for only one or two major sections. ## Problem 2: kick never changes across the track **Fix with Bohm:** create multiple programs with distinct attack, pitch curve, and color. ## Problem 3: breakdowns feel empty instead of intentional **Fix with Bohm:** use Groove rumble or Performer stereo processing as a “ghost rhythm bed” when the main kick drops out. ## Problem 4: bass and kick fight each other **Fix with Bohm:** use Performer ducking and reduce bass density in kick-heavy sections. ## Problem 5: transitions are weak **Fix with Bohm:** automate FX, tone, stereo width, and temporary kick removal before returns. ## Problem 6: modular variation is too random **Fix with Bohm:** use structured timing from dividers, switches, and programmed CV changes rather than free random modulation. --- # Best module pairings for Bohm in a song-focused rack If your goal is full tracks, Bohm pairs especially well with: - **Song-capable trigger/pitch sequencer** - **Mute/performance mixer** - **Bass voice with easy pattern recall** - **Stereo processor / delay / reverb** - **Clock dividers and phrase counters** - **Sequential switches** - **CV recorder or automation module** - **Manual performance controller** - **Filter/EQ for section filtering** - **Looper or sampler** for capturing and reintroducing material A very effective system is: - Bohm = arrangement/drum spine - sequencer = section timeline - bass voice = weight - melodic voice = hook - mixer/mutes = entry/exit of parts - utilities = phrase-level change logic That combination gets you from pattern-making to song-making. --- # Live use vs studio use The manual mentions three modes: - **Studio Mode** - **Live Song Mode** - **Jam Mode** ## Studio Mode Best for: - designing several section-specific kick programs - dialing exact envelope/tone differences - recording automation or multitrack takes ## Live Song Mode Best for: - chaining section changes - predictable arrangement progression - performance with deliberate transitions This is probably the mode to lean on if your issue is “I can improvise grooves but not finish songs.” ## Jam Mode Best for: - finding ideas - improvising transitions - discovering alternate section shapes A smart workflow is: 1. Jam to discover interesting section contrasts 2. Rebuild them as saved programs 3. Arrange them in Live Song Mode 4. Record the full performance --- # Final takeaway Bohm can help create full-length songs because it appears to be more than a kick voice: it is a **section-defining rhythmic architecture module**. Its strongest song-making uses are: - creating **distinct kick identities for different sections** - layering a **secondary low percussion/rumble voice** with Groove - using **ducking, stereo processing, and FX transitions** through Performer - saving **multiple programs** and treating them like arrangement scenes - pairing it with sequencers, switches, mutes, bass voices, and utility modules to create **bar-scale and phrase-scale evolution** If you use Bohm as the **center of energy management** in the patch, it can absolutely help turn a compelling loop into a full arrangement. [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)