TORAIZ SP-16: Add option for mutes to work on the sequencer level and not on the audio level

It would be really good to have the option for muting to happen on the sequencer level, so that muting a track mutes the sequencer but the pad can still be played live, and the samples don't get immediately cut off when muting!

Please consider this as it will add a lot of playability and musical character to the machine.