The term "digital" typically brings to mind sounds that are based on PCM-sampled bass drum, snare drum, or cymbal, but the volca drum creates its drum sounds by DSP-powered analog modeling. Oscillator waveforms such as sine wave, sawtooth wave, and noise are provided. By applying various changes to these waveforms, you can create a wide variety of percussion sounds that range from realistic to idiosyncratic, and are not limited only to drums.
Based on a simple trigger waveform, wave folder and overdrive are used to add overtones and distortion, and then a waveguide resonator effect brings the sound to life. The six-part DSP synth engine was designed differently than conventional drum machines, and generates a wide range of unexpectedly different sounds.
Each part consists of two layers. For each layer, users choose one of five types of oscillator waveform including sine wave, sawtooth wave, and HPF noise, and also choose from three types of pitch modulator and amp EG, each optimized for drum sounds. Layer parameters can be edited either individually or simultaneously, and users can also use the two layers to produce the same sound for additional thickness.
The effect section features a waveguide resonator that's based on physical modeling, and which adds sympathetic resonances to the sound. You can choose from two types of waveguide: "tube" which adds the resonance of a cylindrical object such as a drum body or a long pipe, or "strings" which adds the metallic resonance of a string. The three knobs located in the center of the panel let you specify the DECAY (amount of attenuation), BODY (sonic character), and TUNE (pitch).
Battery life of 10 hours (6 AA, alkaline), or + 9V DC
Dimensions: 193 x 115 x 39 mm / 7.61 x 4.54 x 1.54 inches