The Roland SD-50 is a midi synthesizer, and a great addition to your midi keyboard. Comes with, manual, power supply, midi cable and software.
Asking $260 or willing to trade

Specs:

Compact, portable, USB bus-powered audio and MIDI solution perfect for laptop and mobile use
128 polyphony, 1,125 GM2/GS/SD-50 Solo Tones and 32 drum sets
Features SD-50 Solo Tones including Shakuhachi, Trombone, and Violin
2-in/2-out, 24-bit/44.1 kHz audio interface with XLR inputs, phantom power, Hi-Z input, 1x1 MIDI interface, and V-LINK support
Built-in hardware DSP FX for Reverb, Chorus, and Mastering
USB memory drive for quick playback of MP3/WAV/AIFF/MIDI files
Enhanced Transport Controls for file playback including the ability to change keys, tempos, A/B Loop, Repeat, Center Cancel (for Karaoke) and more
Powered by AC Adaptor, USB bus power, or batteries
Compatible with Windows and Mac computers — Includes SONAR 8.5 LE recording software (Windows
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