Adding a bypass capacitor to the volume pot might help to retain lost highs when the volume setting is reduced. The downside is that with a larger value volume pot, you will lose more highs from the signal when the volume pot setting is reduced but you will not lose quite so much bass. The larger the pot values, the less signal you will lose. This total will be reduced because of the input impedance of whatever the instrument is connected to. The pickup will see a total resistance that is the value of the resistor and the volume pot added together. I would then connect that point to a volume pot of 1 meg log or even 2 meg log if you can get one. If it works but not effectively, try a larger value resistor like 220K or 470K until it does. If the 100K resistor value works then it should do. The tone capacitor can probably be one of the standard values used in electric guitars such as 0.022uF, 0.047uF or 0.1uF. The value of the pot won't affect the bass because the capacitor will stop bass from being lost. The tone control should be a fairly high value, maybe 1 meg log. Wattage rating doesn't matter so you can use a resistor type that is physically very small. I would start with a resistor of maybe 100K between the pickup and the tone control. Adding a suitable resistor in series with the piezo pickup will help to convert the piezo signal so that a guitar tone control will work more like expected. This is why when adding the usual type of guitar tone control to a piezo pickup it acts as a volume control instead of a tone control. Increasing capacitance will reduce volume. Lowering the input resistance will reduce bass. A piezo pickup reacts completely differently. Increasing capacitance will change the resonant frequency to a lower frequency. Lowering the resistance will reduce the amount of the pickup's resonant peak. A standard electric guitar pickup is affected by input resistance and capacitance. Unfortunately typical tone and volume pots do not come in this range so ideally you do need a preamp before any controls. Piezo pickups need a very high impedance. Very unusual and interesting instruments you have there. In case you can't find it in the link above:
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