FWF double bass cardioid microphone + quadruple piezo with preamp and tone control
FWF cello cardioid microphone + piezo with preamp and volume control
FWF violin and viola omnidirectional microphone + double piezo with preamp and volume control
FWF violin and viola passive double piezo pickup with low pass filter
FWF cello passive double piezo pickup with low pass filter
FWF double bass passive quadruple piezo pickup with low pass filter and volume controle