Often when creating a patch, you’ll want to send a signal to more than one destination at once. This is where multipliers, or mults can be very useful. Mults come in two flavours: Passive and Buffered. Passive mults don’t require any power, but buffered mults will need to be powered, so they can also be considered active mults.
Buffered mults provide a perfect copy of the input signal, however with passive mults there will be a small drop in voltage caused by the input and output impedance of your modules.
For this reason you should avoid using passive mults for more critical and precise applications like sending pitch, or you might find that your oscillators detune.