The M-VS1 is a standalone hardware version of the "SR-JV80-04 Vintage Synth" expansion board from the JV series, released in 1995. However, the contents are not exactly the same, with differences in waveform arrangements and patches (presets). It features 8 types of reverb and 3 types of chorus effects. MV-51 sound expansion, with a digital display and volume adjustment. - Brand: Roland - Model: MV-51 - Type: Sound Expansion - Connectivity: Headphone jack - Volume Control: Volume knob - Display: Digital display Thank you for viewing. Type... Electric Guitar