Can you use both pedal outputs at the same time without affecting output sound?

It depends on the pedal and its design. Generally, pedals that have two outputs are meant to be used in stereo setups. This means that each output carries a separate signal, and they are intended to be connected to separate amplifiers or speakers. In this case, using both outputs at the same time will not affect the output sound, as long as the pedals are properly connected.

On the other hand, if you are using a mono pedal that has two outputs, using both outputs at the same time may cause the output sound to be affected. This is because the two outputs are likely connected in parallel, which means that they are essentially merging the signals together. In this case, the output sound may become distorted or muffled if both outputs are used simultaneously.

Therefore, it is important to refer to the pedal's manual to determine whether it is designed for stereo or mono operation, and to use the outputs accordingly to ensure the best sound quality.