Note: Auction links are affiliate links for which the site may be compensated.
via
this auction"The STRETCH expander on is a rare piece that could be purchased separately that had to be installed on your own or by your favorite tech... he Stretch adds the two things DX owners want most of all: more sounds and more features for older model DX drum machines.
For Those DX Machines, features are added like variable clock, auto start, cue tempo, midi clock out & more.
Each stretch voice has its own buttons, tuning, output jack and level control for the mixed output of the DX.
Zif sockets are included to make it easier to add new sounds, containing chip locations for 4 more rows.
4 position: 3 Pitch row(1 chip), 3 Volume(1 chip), 2 Sounds(2 sounds on 1 chip), Long Sound(1st chip 1 sound 2nd chip 2 volumes)"
The DX line had plastic wood sides. You'll find some pics of the inside below.
