From Keen On Keys.

The Casio MT-65, released in 1983, is a small keyboard with 49 mid-sized keys, 8 note polyphony, 12 styles, 20 tones, vibrato, sustain/reverb and modulation FX. It uses the NEC D930/931 ICs which were used for many Casio keyboards between 1983 and 1986. The D930 accompaniment chip is famous for it’s for bass, chord and arpeggio variations, allowing a total number of 768 style variations. The MT-65 was re-released in a different colour as the MT-68 in 1984. There’s also a larger version existing, the CT-405.

Support this channel and buy my little MT-65 album on Bandcamp: https://keenonkeys.bandcamp.com

or listen to some tracks on Soundcloud:

0:00 Intro
0:11 Overview
2:09 A Look Inside
6:30 Tones
15:23 Manual Bass
16:50 Drum Machine
17:53 Single Finger Mode
21:53 Fingered Mode
25:43 Conclusion
26:26 Multitrack Recording

Circuit bended MT-65 picture by S-CAT:
http://www.spacecataudiotechnologies.com/