knobula-drum-farm

Knobula Drum Farm

Three-voice drum machine, sampler and FX engine on one screenless 24HP panel.

24 HP Eurorack module

Drum Farm is a complete drum voice for Eurorack with three independent sound sources — a 16-model drum synth, a 16-slot sampler with two players, and a 16-effect stereo FX engine — all controlled by knobs whose icon rings replace any menu or display. Every voice has its own Decay, Pitch and trigger, plus a Shift-button system that exposes a second function on virtually every control (Gain, Accent, Erase, Set/Insert, Save). The sampler captures audio in real time from the Ext In, slices it across 16 slots per bank, and lets you build kits on the fly with the Get/Get All/Set/Insert workflow. Assignable Trig A/B and CV A/B/C inputs are bound to any control by patching a cable and touching the destination within two seconds.

Features

  • 24HP all-in-one drum module with three independent voices
  • 16 hand-tuned drum synth models selectable via icon-ringed rotary
  • Two-knob (X/Y) macro control per model — no menus or screens
  • 16-slot sample player (Player 1) with Decay, Pitch, Gain, Accent
  • Independent second sample player (Player 2) with Link option
  • Live sampling from Ext In with ON / AUTO / OFF record modes
  • Get / Get All / Set / Insert / Swap workflow for fast kit building
  • 16 user banks plus 16 factory ROM banks (User/Rom switch)
  • 16 stereo effects with always-on Reverb and Echo
  • Two-knob (FX 1 / FX 2) macro control per effect
  • Side Chain effect with built-in kick-keyed compressor
  • Five assignable inputs (Trig A/B + CV A/B/C) via touch-to-assign

Controls & Jacks (44)

  • Player 1 Decay— Sample envelope decay time for Player 1; Shift sets per-voice gain.
  • Player 2 Decay— Sample envelope decay time for Player 2; Shift sets per-voice gain.
  • Drum Synth Decay— Amplitude envelope decay for the synth voice; Shift sets gain.
  • Player 1 Pitch— Sample pitch (±1 octave by default); Shift sets accent amount.
  • Player 2 Pitch— Sample pitch for Player 2; Shift sets accent amount.
  • Drum Synth Pitch— Pitch of the synth voice; Shift sets accent amount.
  • Drum Synth Model— 16-position rotary that selects one of the 16 drum synth models. Icons on the silkscreen ring identify each voice.
  • X— Primary macro for the active drum synth model. Function changes per model (tone, body, snap, etc.).
  • Y— Secondary macro for the active drum synth model. Function changes per model (noise, sustain, character, etc.).
  • FX Select— 16-position rotary choosing the effect inserted across the stereo bus. Reverb and Echo are always-on; positions 3–16 select the additional e
  • FX 1— Primary parameter for the selected effect (rate, depth, amount).
  • FX 2— Secondary parameter for the selected effect (tone, mix, feedback).
  • Bank Select— 16-position rotary (A–P) selecting one of 16 sampler banks. Each bank holds 16 sample slots.
  • Sample Select— 16-position rotary picking which of the 16 slots in the active bank Player 1 (and linked Player 2) plays.
  • Preview— Auditions the currently selected sample. Shift+Preview normalises the sampler buffer.
  • Back— Steps the audition cursor one buffer back. Shift+Back erases the buffer (press twice to erase and roll buffers up).
  • Fwd— Steps forward through the audition buffers. Shift+Fwd resets the cursor to buffer 1.
  • Rec— Three-position record mode: ON arms continuous capture, AUTO arms threshold-triggered capture, OFF disables sampling.
  • Load Bank— Loads the bank pointed to by Bank Select into RAM. Shift+Load Bank saves the active bank back to storage.
  • User/Rom— Slide switch selecting whether Bank Select reads from the user (writable) bank pool or the factory ROM pool.
  • Player 1— Manually fires the Player 1 sample. Long-press toggles random sample selection on each trigger.
  • Mute/Trig— Routes Player 1 audio to the main bus (TRIG) or mutes it while still firing the envelope (MUTE).
  • Player 1 Get— Tap = Get (load the previewed buffer into the active sample slot). Long-press = Get All (load the buffer plus its 15 chops across the bank).
  • Player 2— Manually fires the Player 2 sample. Hold 2 seconds to route the Ext In through Player 2's envelope.
  • Link— Slide switch that links Player 2 to Player 1 (shared sample/decay/pitch) or runs Player 2 as an independent voice.
  • Player 2 Get— Tap = Get (capture buffer into Player 2). Long-press = Swap Player 1 and Player 2 samples. Shift+tap = Insert (paste buffer at current slot,
  • Player 1 Out— Two-position switch sending Player 1 audio to Main or Aux output.
  • Player 2 Out— Two-position switch sending Player 2 audio to Main or Aux output.
  • Drum Synth— Manually fires the Drum Synth voice using current Model / X / Y settings.
  • Load Session— Loads a full session (banks, models, FX, assignments). Shift+Load Session saves the current session.
  • Shift— Modifier button. Hold while turning a knob or pressing a button to reach its silkscreened secondary function.
  • Effects Out— Three-position switch routing the FX engine to Main, Aux, or Off (FX bypassed).
  • Trig A In— Assignable trigger input. Patch a cable then touch any control within 2 seconds to assign Trig A to it.
  • Trig B In— Assignable trigger input. Patch and touch a control to assign Trig B.
  • Player 1 Trig In— Trigger input that fires the Player 1 sample voice.
  • Player 2 Trig In— Trigger input that fires the Player 2 sample voice (or both, if Link is engaged).
  • Drum Synth Trig In— Trigger input that fires the Drum Synth voice.
  • Main Out— Main audio output (full module mix unless individual voices are routed to Aux).
  • Ext In— External audio input. Routed to the sampler for recording or, with Player 2 held, through the Player 2 envelope.
  • Rec Trig In— Trigger input that starts a sample capture (when Rec is ON or AUTO).
  • CV A In— Assignable bipolar CV input. Patch and touch a control to assign CV A to it.
  • CV B In— Assignable bipolar CV input. Patch and touch a control to assign CV B to it.
  • CV C In— Assignable bipolar CV input. Patch and touch a control to assign CV C to it.
  • Aux Out— Auxiliary audio output. Voices set to AUX appear here; useful for parallel processing or separate stems.

How-To Guides

  • Build a 16-step kit on the fly
  • Stacked snare with parallel reverb
  • Generative percussion patch
  • Sidechain duck with built-in compressor
  • Resample a performance into a fresh kit

Explore the interactive Drum Farm panel on BleepDex — tap any control to learn what it does.

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