I was looking over the list of waveforms for the Solo Synth (p.10 of the appendix manual) and see the usual waveforms (sine, triangle, square, sawtooth), but each one has three variations - the waveform itself, then -L and -B. This is true of the XW-P1's native waveforms, plus the ones sampled from other synths (such as the CZ waveforms). But what do these -L and -B suffixes mean? When would you use one vs. the others?