Sound Recorder
When using the sound recorder to create custom voices, be sure you record in a quiet room to minimize ambient noise in the recording. Be sure to trim your samples right at the beginning of the audio, and leave enough time for the audio to decay completely. The recorder will automatically soft clip the samples so don't worry about getting the trim points on zero crossings.
Time Signatures
Be aware that 6/8, 9/8, and 12/8 (and the corresponding /16 times) are all "triplet feel" time signatures. This means that the beat unit consists of a dotted quarter note (dotted quaver) in /8 times and a dotted eighth note (dotted semiquaver) in /16 times. If you need one of these times in a different division, use a corresponding /4 time. For example, to achieve three groups of two eighth notes in 6/8 times, use 3/4 instead.
Click Track Editor
When you add a section to a song in the click track editor, it is inserted at the current cursor position. For example, to insert a section between two others, position the cursor between them and tap the add button. New sections retain all settings from the section directly before it, with the exception of bar count and any tempo variation that may have been set. If tempo variation was set, only the final tempo of the variation will be inherited.