I've tried some great sounding treble boosters. Most have a frequency and gain control, but no volume/level control. Once I get the amount of gain I want, the volume is up there. Sounds great, but not practical. I did try the Naga Viper, which has the separate controls, but it's not exactly the Rangemaster sound I'm looking for. Does anybody know of a Rangemaster circuit with a separate volume control? What would be even better is if somebody here has actually played one. Thanks.