Question: I was doing some experimenting today with my TFB550 and to Crest CA9. I was trying to get just the TF preamp to 'slave' via the ca9. The only way I can get the preamp signal only, without the volume of the TF is to use the XLR DI and it's not a very powerful signal. Even with the Master level for the DI (on the back panel) all the way up the signal is kinda weak. I had to turn up the ca9 channel gain all the way up to get gigging loud. Also, by turning up the bass tone on my Sadowsky bass preamp helped boost the signal quite a bit, but adds more bass tone than I want. Next, I ran the signal from the TF's Effects Loop2 which has all the preamp gain and EQ, enhance, and Timbre. This is much much louder and only had to put the ca9 gain at 25%. I'm not comfortable with this set up though. In order to get any signal at all from the TF you must raise the volume (right side front panel), because the preamp is still routed through the TF internal power amp. This is now sending a powered signal into the back of the ca9, I don't think is a very good idea. Any thoughts on this?? Other alternatives. 1. If I use Effects Loop1 the signal is before the the EQ section of the TF. 2. Direct Inst Output is nothing from the TF, just pure instrument input signal. 3. The Phone/Line Ouput (front panel) output is the entire preamp and power amp of the TF. Again .. going into the ca9 with powered signal... I guess my big question here is, will the signal from the TF's power section harm th CA9 with more than just a line level signal ?? Am I missing something here?