I did exactly what you're proposing to my Bugle that I've been using previously. I soldered in resistor mounting slots for swapping 4 resistors in the gain circuit (R3, R5, R21, R23). To set gain back to factory 40dB, swap in 1.30k resistors. If you need even less gain, use resistors of a bit higher resistance. If you're more conversant with electronics, you can even install a gain selector or a pot. Good luck!