Beast's Chalkboard is a 2-channel high precision voltage adder. Each channel adds the voltage value selected from -2V to 2V to the input signal and outputs it from two outputs. If there is no input for channel 2, the input signal of channel 2 will be routed to channel 1 by internal connection. In addition, the input signal is output as is from Thru.
It's a simple but easy and highly accurate octave change, and it's a utility module that will be very useful for changing the frequency of the modulator during FM!