I used the Tonebone PZ Pre for years and it is a great durable unit with lots of control but ultimately the lack of independent eq for each channel became too much of an issue.
Also a big drawback for me was the fact that although the tuner output is always on when the mute switch is engaged it is always being fed by both inputs. In my case I could not tune my mandolin mid song because all of the stage sound was also being picked up by my dobro cone. When you hit mute it is muting the output. Both inputs are still connected to the tuner.
I now use the Grace Felix and also find it to be the best unit out there.
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