The VM-3100 PRO comes with two mono compressors that can be selected for use with any channel. Use the following procedure to add a compressor to a channel:
1. While holding SHIFT, press COMP 1 or COMP 2.
2. Use the VALUE dial to select a channel.
1. While holding SHIFT, press COMP 1 or COMP 2.
2. Use the VALUE dial to select a channel.