I would give it a try. I'm trying to rememeber but I thought you can set any input to the bypass mode. It's my understanding that in bypass, however, some other component would be needed to control the volume. (I'm going on memory here.)
Nothing is going to happen even if you do connect an input wrong. It is all very low signal voltages. Just try not to put an input signal to the output connection on the preamp. Other than that, you should be fine.
It will work with the ouput of the Rhea connected to any of the inputs you select.
Try the tape and if it does what you want, you're good to go. If not, use any of the other inputs.
Nothing is going to happen even if you do connect an input wrong. It is all very low signal voltages. Just try not to put an input signal to the output connection on the preamp. Other than that, you should be fine.
It will work with the ouput of the Rhea connected to any of the inputs you select.
Try the tape and if it does what you want, you're good to go. If not, use any of the other inputs.