intellijel/rainmaker
Rainmaker
A high-quality stereo rhythmic delay and comb resonator Eurorack module featuring a 16-tap rhythm delay line (each tap with its own multimode filter and granular pitch shifter) and a 64-tap tunable comb resonator, with extensive voltage control, 128 preset slots, and FPGA-based 96kHz/32-bit internal processing.962
Capabilities 4
- Comb Filtercomb-filter
- 64-tap stereo comb resonator with 16 tap-spacing patterns, variable density (1–64 taps), and a tunable 1V/oct input for Karplus-Strong and modal synthesis.962
- Multi-Tap Delaymulti-tap-delay
- 16-tap stereo rhythm delay; each tap has an independent 2nd-order multimode filter and granular pitch shifter with up to 20 seconds delay time.962
- Pitch Shifterpitch-shifter
- Each of the 16 delay taps has an independent granular pitch shifter (−16 to +15 semitones). The feedback path also has its own pitch shifter.962
- Reverb-like spectral processingreverb-like-spectral-processing
- The comb resonator can produce reverb-like and resonator effects, particularly at large comb sizes and high tap counts.962
Jacks 16 (13 in / 3 out)
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (13) | |||
| 1V/OCT | cv | — | 1V/octave pitch CV input for the comb resonator; each 1V increase halves the comb size (raises pitch by one octave). No attenuator — maintains precise exponential tracking.962 |
| COMB CLK | clock | — | Clock input for the comb resonator section; when CLK SRC is set to COMB CLK, sets comb size to clock period times CLK DIV.962 |
| COMB FEEDBACK CV | cv | — | CV input for comb resonator feedback amount; summed with the COMB FEEDBACK potentiometer.962 |
| COMB SIZE CV | cv | — | CV input for comb size (linear offset); summed with the 1V/OCT input and COMB SIZE potentiometer. Has an associated attenuator.962 |
| DELAY CLK | clock | — | Clock input for the rhythm delay section; overrides tap-tempo and sets beat time to the clock period times the CLK DIV setting.962 |
| DELAY FEEDBACK CV | cv | — | CV input for rhythm delay feedback amount; summed with the DELAY FEEDBACK potentiometer.962 |
| FEEDBACK TONE CV | cv | — | CV input for the feedback filter tone control; summed with the FEEDBACK TONE potentiometer.962 |
| IN L | audio | — | Left channel audio input. Normalled to IN R when no cable is inserted in IN R.962 |
| IN R | audio | — | Right channel audio input. Receives normalled signal from IN L when no cable is inserted.962 |
| MOD A | cv | — | Assignable modulation CV input A; normalled to MOD B. Routes to a user-selected parameter destination per preset.962 |
| MOD B | cv | — | Assignable modulation CV input B; receives normalled signal from MOD A when unpatched. Routes to a user-selected parameter destination per preset.962 |
| PITCH SHIFT CV | cv | — | CV input for the global pitch shift applied to all 16 rhythm delay taps; summed with the PITCH SHIFT potentiometer.962 |
| TRIG | trigger | — | Trigger input for the delay section; positive pulses execute the configured trigger operation (freeze, reverse, randomize, ping, etc.).962 |
| Outputs (3) | |||
| CLK OUT | clock | 0V to 5V | Clock output — a square wave at the delay beat time, used to sync other modules.962 |
| OUT L | audio | — | 962 |
| OUT R | audio | — | 962 |
Parameters 43
| Name | Type | Range | Behavior |
|---|---|---|---|
| COMB CLK DIV | menu_setting | — | Sets the clock division factor for the comb resonator. Possible settings: /1 through /256. In COMB SIZE mode, doubling CLK DIV doubles the comb size.962 |
| COMB CLK SRC | menu_setting | — | Selects how the comb size is determined: COMB CLK (from right CLK jack × CLK DIV), COMB SIZE (from 1V/OCT + SIZE CV + pot), or Encoder (manual entry only).962 |
| COMB FEEDBACK | knob | — | Adjusts how much of the 64th comb tap is fed back to the input; summed with the COMB FEEDBACK CV input. High levels with short comb sizes produce Karplus-Strong string-like sounds.962 |
| COMB PATT | menu_setting | — | Selects one of 16 preset patterns for the relative timing of the comb's 64 taps, providing different resonator timbres or echo rhythms.962 |
| COMB SIZE | knob | — | Sets the comb delay size (delay time of tap 64) when CLK SRC is in COMB SIZE mode; acts as a linear offset summed with the 1V/OCT and SIZE CV inputs.962 |
| COMB SIZE TIME | menu_setting | 0.1ms – 20000ms | 962 |
| COMB SLOPE | menu_setting | — | Sets the relative amplitude envelope across the comb's taps: Flat, Rising, Falling, or Rise/Fall. Affects timbre at short comb sizes and creates swells/decays at large comb sizes.962 |
| COMB TAPS | menu_setting | 1 – 64 | Sets how many of the 64 comb taps are included in the summed output. Tap 64 is always included. Reducing the count removes taps in a pattern that maintains uniform distribution.962 |
| DELAY CLK DIV | menu_setting | — | Sets the clock division factor for the rhythm delay; the beat time equals the CLK input period times this divisor. Possible settings: /1 through /256.962 |
| DELAY FEEDBACK | knob | — | Controls the amount of the rhythm delay feedback tap mixed with the input signal. The feedback source tap is set via the FEEDBACK:TAP# button.962 |
| DELAY TAP TIME | menu_setting | 0.1ms – 20000ms | The overall delay time applied to all 16 rhythm delay taps, scalable from 0.1 ms to 20 seconds. Can be set by encoder, tap tempo, or external clock with divider.962 |
| DELAY WET/DRY | menu_setting | — | Sets the internal wet/dry mix for the rhythm delay section (separate from the global MIX knob).962 |
| FEEDBACK PITCH L | menu_setting | — | Sets the pitch shift amount for the left feedback channel's granular pitch shifter.962 |
| FEEDBACK PITCH R | menu_setting | — | Sets the pitch shift amount for the right feedback channel's granular pitch shifter.962 |
| FEEDBACK TAP# | menu_setting | 1 – 16 | Selects which tap's output feeds back to the input for echo regeneration, independently for left and right channels. Additional options: ALL (post-mix output) and COMB SIZE (variable-position tap following the comb size CV).962 |
| FEEDBACK TONE | knob | — | Applies a first-order lowpass/highpass filter to the feedback signal. At center (12 o'clock) the filter is flat; CW increases highpass cutoff; CCW decreases lowpass cutoff.962 Zones
|
| GRAIN QTY | menu_setting | — | Sets the number of grains used by the granular pitch shifters. Options: 1, 2, 4 (triangular envelope with overlap), or 1 with no envelope (rectangular grain). More grains overlap to reduce comb-filtering artifacts.962 |
| GRAIN SIZE | menu_setting | 5ms – 671ms | Sets the time interval (duration) of each grain used by the granular pitch shifters. Eight discrete steps from 5 ms to 671 ms.962 |
| GROOVE AMT | menu_setting | 0 – 100 | Blends between the Straight (equally spaced) tap pattern at 0 and the selected Groove type pattern at 100.962 |
| GROOVE TYPE | menu_setting | — | Selects one of 16 groove patterns that set the relative timings of the 16 rhythm delay taps (e.g. Straight, Swing, Hard Swing, Waltz Time, Early Reflection, etc.).962 |
| MIX | knob | — | Controls the dry/wet blend at the audio outputs. Mixing is done in the analog domain. CCW is fully dry; CW is fully wet.962 |
| MOD A | knob | — | Attenuator and selector for the MOD A assignable modulation signal. Pressing the associated white button displays and allows editing of the MOD A destination parameter.962 |
| MOD B | knob | — | Attenuator and selector for the MOD B assignable modulation signal. Pressing the associated white button displays and allows editing of the MOD B destination parameter.962 |
| PITCH SHIFT | knob | -2octave – 2octave | Applies a global pitch shift to all 16 delay taps; does not affect the feedback signal. Has a dead band at center (12 o'clock) where shift is zero.962 |
| RAND DESTINATION | menu_setting | — | Selects which parameters are randomized when a randomization event occurs. Options range from individual tap attributes to all delay/comb parameters.962 |
| REVERSE | menu_setting | — | Enables playback of the delay input buffer in reverse. When ON, the read pointer steps back by the feedback tap time, then reads forward in a loop. Can also be toggled via the TRIGGER button or TRIG input.962 |
| ROUTING | menu_setting | — | Selects the signal routing between delay and comb sections: DLY > CMB (series), DLY + CMB (parallel), or L:DLY R:CMB (split stereo).962 |
| SIZE MOD LEVEL | menu_setting | 0 – 15 | Sets the depth of the comb size modulation LFO. 0 = no modulation; 15 = 10 ms amplitude.962 |
| SIZE MOD RATE | menu_setting | — | Sets the rate of the comb size modulation LFO in Hz.962 |
| SIZE MOD WAVE | menu_setting | — | Selects the LFO waveform for comb size modulation: OFF, Sinusoid, Triangle, Vibrato 1, Vibrato 2, Down Chirp, Up Chirp, or Random.962 |
| Tap CUT | menu_setting | 0Hz – 4095Hz | Sets the cutoff frequency of each tap's 2nd-order multimode filter. Affects LP, BP, and HP modes; has no effect when filter TYPE is set to None.962 |
| Tap DETUNE | menu_setting | — | Fine pitch adjustment below one semitone, added to the tap's PITCH SHIFT value. Accessed by pressing the PITCH SHIFT button a second time.962 |
| Tap LEVEL | menu_setting | 0 – 15 | Per-tap output gain before summing; values increase exponentially. A value of 0 mutes that tap. Taps with gain above 0 have their numbered LED lit.962 |
| Tap MUTE | button | — | Toggles the mute state for a single tap; when muted that tap's output is excluded from the delay sum. Muted taps are shown with a crosshatched bar in the LEVEL display.962 |
| Tap PAN | menu_setting | -7 – 7 | Controls each tap's stereo position. In stereo mode acts as a balance control; in mono mode acts as a pan control. Range is 7L (full left) through 0 (center) to 7R (full right).962 |
| Tap PITCH SHIFT | menu_setting | -16semitone – 15semitone | Shifts each tap's output pitch in semitone steps. Negative values lower pitch; positive values raise pitch. Also has a DETUNE sub-parameter for fine adjustment below one semitone.962 |
| Tap Q | menu_setting | 0 – 15 | Sets the resonance of each tap's multimode filter. Higher values emphasize frequencies near cutoff. At high Q the filter can self-oscillate and overdrives easily.962 |
| TAP STACK | menu_setting | — | Groups taps into stacks that share the same delay time. Useful for applying multiple pitch shifts or filters at the same moment, e.g. creating chord effects.962 |
| Tap TYPE | menu_setting | — | Selects the filter mode for each tap's 2nd-order multimode filter: None (bypass), Lowpass, Bandpass, or Highpass.962 |
| TIME MOD LEVEL | menu_setting | 0 – 15 | Sets the depth of the rhythm delay time modulation LFO. 0 = no modulation; 15 = 10 ms of time modulation amplitude.962 |
| TIME MOD RATE | menu_setting | — | Sets the rate of the rhythm delay time modulation LFO in Hz. Press-while-rotate increases step size for faster navigation.962 |
| TIME MOD WAVE | menu_setting | — | Selects the LFO waveform for rhythm delay time modulation: OFF, Sinusoid, Triangle, Vibrato 1, Vibrato 2, Down Chirp, Up Chirp, or Random.962 |
| TRIGGER MODE | menu_setting | — | Selects what action a trigger event (from TRIGGER button or TRIG input) performs: Freeze, Reverse, Randomize, Delay/Comb/All Mute, Delay/Comb/All Bypass, Ping Input, Shaped Pulse, Toggle PingPong, Gated Freeze, Gated Reverse, Preset Load, or Clear Buffer.962 |
Firmware history 2 versions
| Version | Released | Notes |
|---|---|---|
| 1.09 | — | Added Mod B Only Destination for Rhythm Delay Time; added option to reduce MOD LEVEL amplitude by factor of 8; changed preset load/save so that the last saved/loaded preset is loaded on power up; added 'Random' randomize mode; added DLY CLK/T to comb CLK SRC list; added five new MOD A/B destinations; added Automatic Gain Control to feedback and output pathways. Fixed: routing not loaded from preset, preset loading screen hang, randomizer out-of-range values.962 |
| 1.05 | — | Renamed 'PILE' to 'STACK' on panel and in interface (no functional change). Changed preset load behavior: holding LOAD while pressing encoder now loads only active-effect parameters (previously the default). Improved interpolation in rhythm delay and comb modulation LFOs to reduce clicks and artifacts.962 |
References 2
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Intellijel Cylonix Rainmaker product pageproduct_page● verified 2026-05-25