Doubler Ultra's special alghorithm designed to imitate a double tracked guitar effect in real-time.
To recreate the second guitar it uses left channel information, so make sure that your target guitar signal
is presented in the left channel. It's recommended to it use with clean DI (direct injection) guitar tracks, e.g. without
any processing (except noise gates, eq, compression and noise reduction).

by Vadim Taranov.