ammoon Midiplus MiniEngine USB MIDI Sound Module General MIDI Generator Provides 128 standard GM tones, up to 64 polyphony output. 16 bit sampling accuracy of the data, 48kHz sampling frequency, 24dB sound digital filtering. Data rotary knob to adjust Volume, Program, Reverb effects. Support all the MIDI devices that have MIDI output or USB output. Support MIDI IN and USB HOST working simultaneously.