2hp Pluck

Four-voice Karplus-Strong string synthesizer in 2hp

2 HP Eurorack module

Pluck is a Karplus-Strong algorithm based string synthesizer capable of four-voice polyphony. By adjusting the Damp and Decay controls, it can produce sounds ranging from bright harp-like plucks to grungy, muted bass tones. Its expressive pitch control remains active after triggering, enabling vibrato and slew effects on ringing notes.

Features

• Four-voice polyphony with oldest-voice replacement
• Karplus-Strong algorithm based string synthesis
• 1V/Octave pitch tracking
• Bipolar CV input for Damp (-5V to 5V)
• Bipolar CV input for Decay (-5V to 5V)
• Pitch knob remains active on most recently generated note for vibrato and slew
• Output LED visualizes amplitude
• 10Vpp audio output
• 2HP Eurorack form factor

Controls & Jacks (9)

• Decay— Adjusts string size independent of pitch. Fully left dampens most harmonics; fully right increases harmonic content. Only affects generation
• Damp— Sets duration of pluck sound for new notes. Fully left is shortest; fully right is longest. Also affects harmonic content and duration. Only
• V/Oct— 1V/Octave CV input for pitch control.
• Output LED— Visualization of the amplitude of the output signal.
• Trig— Trigger input to create a new note with current knob and CV settings.
• Damp CV In— Bipolar CV input for dampening control. Range: -5V to 5V.
• Decay CV In— Bipolar CV input for decay control. Range: -5V to 5V.
• Out— 10Vpp audio output of synthesized string sound.
• Pitch— Sets fundamental frequency of string sound. Remains active for most recently generated note, allowing vibrato, slew, and tuning while note r

How-To Guides

• Basic Plucked String
• Grungy Muted Bass
• Four-Voice Chord Strum
• Vibrato on Ringing Note
• Timbral Sweep with Damp CV
• Rhythmic Decay Variation
• Pitch Glide Between Notes
• Percussive Snap Pluck
• Long Resonant Drone

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