# Qu-Bit — Synapse - [Manual PDF](../../manuals/Synapse.pdf) --- [Manual PDF](attachment) # Qu-Bit Synapse: using it to create melodic components Synapse is not a pitch quantizer or traditional sequencer, but it **can absolutely be used to build melodic material** because it combines: - 4 crossfaders - routable/sequential switching - 8 memory states - internal +5V offsets - internal LFOs - CV/audio compatibility throughout That means it can act as a: - stepped CV composer - phrase selector - melodic router - stored-voltage pattern source - animated modulation source for pitch-related destinations ## What Synapse does that matters for melody From the manual, the most melody-relevant features are: - **DC-coupled inputs**: works with CV as well as audio - **Per-channel A/B crossfading**: blend between two voltages per channel - **+5V DC offset normalled to each B input**: lets each channel generate CV without external sources - **8 memory locations**: store crossfade positions and recall them with one knob - **Sequential/routable outputs via Terminal and Advance** - **Inertia**: slews transitions between stored states - **Internal LFOs**: can animate pitch/modulation patterns - **Sum outputs**: combine channels into more complex control voltages ## Important melodic concept Synapse excels when you think of it as a **voltage-scene morphing router**. Each of the 4 channels can hold a voltage or blend between two voltages. Then the module can: - save those blends into memory slots - advance/swizzle routing - sum channels - slew transitions So instead of a classic “one note per step” sequencer, it’s more like: - **one harmonic/melodic state per memory** - **one destination/output arrangement per switch state** - **one evolving phrase through interpolation, switching, and summed CV** ## Melodic patch strategies ## 1. Use Synapse as a 4-stage stored voltage sequencer This is the most direct melodic use. ### How - Enable the **+5V DC offset** on B inputs. - Leave A inputs unpatched, or feed them with 0V / another reference voltage. - Use each channel’s crossfade knob to choose a voltage between A and B. - Send a channel output to an oscillator’s **1V/oct** input, ideally through a quantizer if you want strict tuning. - Use **Advance** to step routing through outputs. ### Why it works With DC offset enabled, each crossfade becomes a voltage chooser. The manual explicitly notes this can make Synapse function like: - a **four step sequencer** - an **eight stage stored voltage source** ### Musical result You can create: - bassline steps - lead note contours - transposition voltages - motif fragments ### Best companion modules - quantizer - sample & hold / clock source - envelope + VCA - oscillator with stable tracking ### Tip Because the B input is +5V when enabled, the crossfade knob becomes a performance control for stored CV amount. Save multiple memories and you get phrase recall. --- ## 2. Build 8 melodic “phrases” with Memory Memory is where Synapse becomes especially useful for composition. ### How - Create four voltage settings across the four crossfade channels. - Save them to one memory slot. - Change the four fader positions to a new shape. - Save again. - Repeat for up to **8 memories**. Then sweep or CV the **Memory** control to recall different stored voltage arrangements. ### Why it’s musical Each memory slot can represent: - a chord tone set - a bass phrase - a transposition profile - a melodic contour - a verse/chorus variation ### Important manual behavior - When a memory location is selected, **crossfade CV inputs are disabled** - Changes aren’t stored until **Save** is pressed - Fully CCW on Memory = **memory bypass** ### Melodic uses - 8 different note clusters - 8 phrase presets - 8 harmonic regions for transposition - song section changes without repatching ### Strong patch idea Use: - **Out 1** -> quantizer -> VCO pitch - **Out 2** -> second quantizer/VCO pitch - **Out 3** -> filter cutoff - **Out 4** -> FM amount or wavefold amount Now each memory slot becomes a full melodic “scene.” --- ## 3. Use it as a melody generator before a quantizer Synapse is especially powerful **upstream of a quantizer**. ### How Patch Synapse output into: - quantizer input - then quantizer output to oscillator 1V/oct ### Why Synapse can generate rich, unstable, blended, slewed, shuffled voltages. A quantizer then converts those into usable musical notes. ### What this gives you - playable melodic randomness - phrase morphing - evolving sequences - repeated motifs with variation ### Great sources for A/B inputs Feed the A and B inputs with: - slow LFOs - envelopes - offsets - random stepped voltages - another sequencer’s rows - pressure/controller CV Then use Synapse to blend and reroute before quantization. ### Result Instead of programming exact notes, you shape a **melodic probability field** that the quantizer turns into scales/arpeggios. --- ## 4. Crossfade between two pitch sequences A very strong use case. ### How For each channel: - patch one sequencer row or CV source into **A** - patch another sequence into **B** - send the resulting output to a quantizer or oscillator pitch input ### What happens The crossfade knob and CV let you interpolate between two melodic lines. ### Musical outcomes - phrase mutation - call/response between two melodies - morphing bassline - gradual harmonic transition ### With Memory Store multiple crossfade positions: - Memory 1 = mostly A - Memory 2 = balanced - Memory 3 = mostly B - etc. Now you have recallable interpolation states between two sequences. ### With Inertia Add glide between memory changes for: - portamento - phrase smearing - expressive transitions --- ## 5. Use 4 channels as harmonic interval generators Synapse can generate related CVs on multiple outputs. ### How Set each channel to a different fixed CV amount using the +5V offset or external voltage references. For example: - Ch1 = root - Ch2 = third-ish voltage - Ch3 = fifth-ish voltage - Ch4 = octave or seventh Then send those outputs to: - multiple quantizers/oscillators - precision adders - switch matrix destinations ### Result You can create: - chord voicings - parallel melodic intervals - stacked canon lines - drone harmony structures ### Better with quantizers Because raw CV won’t necessarily correspond to exact intervals, quantizers make this much more musical and repeatable. --- ## 6. Sequentially route one melodic line to different voices The **Terminal** switching section makes Synapse useful as a melodic distributor. ### How Patch a pitch CV source or melodic blend through Synapse, then use the outputs to address: - multiple oscillators - different quantizers/scales - separate voice chains Use: - **Terminal encoder** for manual routing shifts - **Advance** input for clocked movement - **Scatter** for shuffled routing ### Melodic use One sequence can be sent to different destinations over time, creating: - rotating counterpoint - pseudo-rounds/canons - changing voice assignments - phrase movement across timbres ### Example - Out 1 -> quantizer in C minor -> VCO 1 - Out 2 -> quantizer in pentatonic -> VCO 2 - Out 3 -> filter ping pitch CV - Out 4 -> FM oscillator pitch Advance the switch with a clock and one source becomes a changing melodic orchestrator. --- ## 7. Use Scatter for melodic permutation The **Scatter** function shuffles output positions. ### Why this is good for melody It creates permutations of where voltages go. If each output drives a different pitch destination or quantizer, a shuffle creates: - rearranged melodic order - changed voicings - altered call/response behavior - spatialized note movement ### Best patch Set up 4 distinct voltage channels, each feeding different harmonic functions, then trigger Scatter rhythmically but not every beat. This gives phrase reshuffling without changing the underlying note material. --- ## 8. Use Sum outputs for composite melodic CV Synapse includes: - **1+2** - **3+4** - **Sum** From the manual: - **1+2 / 3+4** are post-switch sums - **Sum** is pre-switch sum of each crossfade channel ### Melodic use Summing CV sources is extremely useful for: - transposition - interval stacking - phrase complexity - combining motion layers ### Patch examples - Channel 1 = base pitch contour - Channel 2 = small interval modulation - Channel 3 = octave jumps - Channel 4 = slow transposition Then: - **Sum** -> quantizer -> oscillator Now your pitch line is the combined result of multiple independent melodic influences. ### Another option Use: - **1+2** as bass pitch CV - **3+4** as lead pitch CV This can create related but distinct melodic lines from the same patch. --- ## 9. Use Inertia for melodic glide and phrase smoothing The **Inertia** control adds slew to changes in: - memory location - crossfade knob moves - crossfade CV input changes Range is up to **5 seconds**. ### Why it matters This turns abrupt CV changes into: - portamento - slide between notes - phrase rubato feel - smoothed transitions between melodic states ### Great use cases - acid-style slides - gliding between stored memory phrases - smoothing random voltages before quantization - generating legato motion from stepped sources ### Tip Use moderate inertia before a quantizer for evolving melodic movement, or after quantized pitch if you want actual continuous pitch glide. --- ## 10. Internal LFOs for animated melodic modulation The internal triangle LFOs can modulate each crossfade channel. ### Why useful for melody If the channels are producing pitch CV or transposition voltages, the internal LFOs can create: - vibrato-like pitch motion - note cycling between A and B voltages - repeating melodic oscillation - canon-like phased movement between channels ### Key LFO features - per-channel amplitude - shared frequency - multiple relationship modes: - Phase Offset - Alternating - Cascading - Synchronous ### Best melodic application Use internal LFOs **before quantization**. That way the LFOs don’t just create vibrato—they create **motion through discrete notes** once quantized. ### Especially useful modes - **Phase Offset**: creates rotating melodic movement between channels - **Alternating**: useful for call/response two-voice phrases - **Cascading**: excellent for sequential melodic activation - **Synchronous**: stacked harmonic pulsing --- ## Practical melodic patch examples ## Patch 1: 8-state bass sequencer ### Goal A recallable bassline source. ### Patch - Enable **+5V DC offset** - Set four channels to four different CV levels - Patch **Sum** -> quantizer -> VCO 1V/oct - Clock envelopes/VCA separately - Save 8 different memory states ### Result Each memory becomes a different bass pattern contour. Use the Memory knob manually or with CV to move between bass phrases. --- ## Patch 2: Morphing lead between two melodies ### Goal Blend two sequencers into one evolving lead. ### Patch - Sequencer A CV -> channel A inputs - Sequencer B CV -> channel B inputs - Crossfade outputs -> quantizer -> VCO - Use crossfade CV inputs or internal LFOs - Add **Inertia** for glide ### Result A lead line that continuously mutates between two source melodies. --- ## Patch 3: Four-note chord engine ### Goal Create harmonic material from fixed voltages. ### Patch - Enable +5V offset - Set channels to four different voltage levels - Out 1-4 -> four quantizer channels / four oscillators - Save multiple memory states as different voicings - Use Advance or Terminal to rotate assignments ### Result Stored chord voicings and melodic inversions with dynamic voice reassignment. --- ## Patch 4: Quantized melody from animated voltages ### Goal Generate self-moving melodic content. ### Patch - Enable +5V offset or patch offsets/random CV into A/B inputs - Set LFO amplitudes per channel - Choose **Cascading** or **Phase Offset** LFO relationship - Patch **Sum** -> quantizer -> oscillator ### Result An automatically evolving melodic line with recurring structure. --- ## Patch 5: Counterpoint by switched destination routing ### Goal One CV source creates multiple interrelated melodic voices. ### Patch - Build 4 distinct CV blends on Synapse - Route outputs to: - Out 1 -> quantizer 1 -> VCO 1 - Out 2 -> quantizer 2 -> VCO 2 - Out 3 -> precision adder transpose input - Out 4 -> FM voice pitch - Use **Advance** with clock divisions - Occasionally trigger **Scatter** ### Result Rotating contrapuntal lines and shifting harmonic functions. --- ## Patch 6: Memory as song-section transposer ### Goal Use Synapse to transpose a melodic sequence differently per section. ### Patch - Main sequencer -> precision adder input A - Synapse output -> precision adder transpose input - Build memory states containing different DC voltages - Save 8 transposition values or 8 four-channel transposition sets ### Result Verse, chorus, bridge transpositions are instantly recallable. --- ## Things to watch out for ## 1. Raw pitch CV may need quantization Synapse outputs continuous CV. For tonal melodic work, a **quantizer** is highly recommended. ## 2. Memory disables channel CV inputs When a memory slot is selected, the crossfade CV inputs are disabled. So if your melody depends on external modulation per channel, memory mode changes that behavior. ## 3. LFO frequency goes very high It ranges up to **1kHz**, which is more audio-rate territory. For melody, you’ll usually want much slower settings unless intentionally creating complex CV behavior. ## 4. Switching and pitch Click-less switching is great for audio, but for pitch CV changes you may still want to manage: - clock timing - quantizer response - slew via Inertia ## 5. Saved state behavior A lot of the module’s state is stored to permanent memory. That’s helpful for performance patches, but remember your last-used settings may reappear on reboot. ## Best companion modules for melodic systems Synapse pairs especially well with: - **Quantizers**: essential for tonal pitch generation - **Precision adders**: for transposition workflows - **Sequential clocks/gates**: to drive Advance and event timing - **Envelope/VCA chains**: to articulate notes - **Oscillators with good 1V/oct tracking** - **Clock dividers/probability modules**: for phrase variation - **Buffered mults/mixers**: to distribute melodic CV - **Sample and hold/random sources**: for semi-composed melodies ## Best musical roles for Synapse If you’re building melodic music, Synapse is strongest as: 1. **a stored voltage phrase generator** 2. **a sequencer morphing tool** 3. **a transposition and interval source** 4. **a multi-voice pitch router** 5. **an evolving CV composer before a quantizer** It is less ideal as: - a precise note-entry sequencer - a standalone quantized melody source - a traditional keyboard replacement ## Bottom line Synapse is best understood as a **melodic infrastructure module** rather than a dedicated sequencer. It helps create melody by letting you: - generate CV from offsets - blend between two melodic voltages - store phrase states - slew between them - sum them into more complex pitch contours - route them across multiple voices - animate them with internal LFOs - permute destination assignments In a Eurorack melodic system, the most powerful setup is usually: **Synapse -> quantizer / precision adder -> oscillator(s)** That turns its fluid, morphing voltage behavior into playable, structured musical notes. [Generated With Eurorack Processor](https://github.com/nstarke/eurorack-processor)