The TASCAM 234 Syncaset was the first 4-track rack-mountable cassette recorder/reproducer with dbx and 3 3/4 IPS tape speed.
The 234 is a front-loading, rack-mountable cassette deck. It has VUs for each track, 1/4" ins, RCA outs, Dolby II NR, recording speed of 3 3/4 ips (double that of most cassette decks) and is variable +/- 12%. Additionally, each track features its own input, output and pan controls.
The Gear Rack