If you use Kaleidoscope to split stereo recordings into pairs of mono recordings, Kaleidoscope will add a channel indicator to the file names of the mono recordings. For example, the stereo file SN_DATE.wav will be split into the mono files SN_0_DATE.wav, from channel 0, and SN_1_DATE.wav, from channel 1.
The recordings produced by your SM2Bat+ or SM3Bat are marked by what channel prompted the Song Meter to start recording. For example, SN_0_DATE.wav is a stereo recording that was triggered by a signal detected on channel 0. If you use Kaleidoscope to split this stereo recording into two mono recordings, it will add an additional indicator telling you which channel's data each recording represents. For example, the stereo file SN_0_DATE.wav will be split into the mono files SN_0_0_DATE.wav, from channel 0, and SN_0_1_DATE.wav, from channel 1.
SN_0+1_DATE.wav is a stereo recording that was triggered by signals detected on both channel 0 and channel 1. When this file is split into mono recordings, they will be labeled SN_0+1_0_DATE.wav and SN_0+1_1_DATE.wav.