“”Pedal’s variable Level and Sustain controls allow you to dramatically
“squash” the input signal, yielding smooth, clean bell-like notes that
last for days. In addition, the ST-2 features a direct on/off switch.
When engaged, the direct switch blends in a dry input signal at equal
volume with the compressed signal, eliminating the attack-altering
characteristics common to other compressors.”
“My favorite part is the direct switch which blends back in
some of the uncompressed signal. This gives the benefit of natural
initial attack even when the compressor is engaged on a high setting.”
More information on this effect can be found here.