Tascam DX-4D 4 channel Professional Noise Reduction Rackmount. DBX 1.
Works for Teascam 32, 34, 34b, 38 (needs 2 connected togerther for all 8 channels), TEAC A-3340, and others.
Please make sure that this NR unit will work on your deck as the TASCAM/TEAC deck controlls the operation via included (connected) cable.