I'm assuming you are using the Studo 24 mixer, do you have your cassette hooked up to the 2-TRACK outputs?? If so, depress the 2-TRACK function button located in the control section of the board. Have you checked your cables leading to 2-TRACK ? Your cables might be shorted.
When playing, are you sure that you have yourGRP 1&2
faders even!!?? This is also true when mixing down Think of your
GRP1&2 as 2-track pan faders which both control the signal going into the L&R channels of the .2-TRACK .