The Tascam MIDI Studio 644. Bought this a while back planning to mix and master fully on here. One problem: no way to plug it in. : r/synthesizers,Cassette Recorder TASCAM 644 Midistudio Mixer Professional Hi-Fi Graphic Equalizer, How look inside?,TASCAM Midistudio 644 MTR,Tascam 644 Midistudio Cassette Recorder 4-Track Graphic Equalizer Meter Japan