Erica Synths Bullfrog, Monophonic Desktop Synthesizer, Designed for creative learning of subtractive sound synthesis, VCO with tuning control, FM input, sine and pulse waveform and shape/PWM control with CV input, 3-Channel mixer for sine, pulse and noise, Low-pass filter (-24 dB/oct.) with controls for cutoff, resonance and CV input with attenuator, VCA with offset control and CV input with attenuator, Delay with settings for delay time, feedback and wet/dry mix, 2 Attack/release envelopes with switchable loop mode, CV inputs for both time parameters, gate input, unipolar and bipolar output, Sample & hold stage with rate control, pulse output, gate button and selectable clock source (free/gate), Clock divider with 4 outputs - /2, /4, /8, /16, Functions can be extended by plug-in voice cards - sequencer, acid bassline and sampler looper included in delivery, Line output: 6.3 mm jack, Stereo headphone output: 3.5 mm jack, CV/gate inputs: 3.5 mm jack, MIDI In: 5-pin DIN and USB MIDI, Dimensions (W x D x H): 385 x 210 x 40 mm, Weight: 1.8 kg, Incl. external power supply (12V DC), operating instructions, 10 templates, 10 patch cables, 3 pre-configured voice cards and 3 DIY voice cards