re. 1) AUDIO EXPORT/MULTIPLE BUSES
yes. it's caused by the multiple buses output being mixed (added) straight together. fact is that the whole mix may well exceed the regular audio full-scale for floating-point sample data format, which is [-1.0, +1.0] (0dBfs) and when it does it get's hard-clipped when exporting/converting/writing into a non-float sample file format (eg. standard 16bit signed WAV).
you have two choices: a) dim out the output volume of each bus as much until the whole mix doesn't ever over 0dBfs, ever; you can monitor this with some external meter(ing or ppm), the connections of which replicate the converging multiple buses you're trying to export. b) export to a float sample file format (eg. ogg vorbis) where hard-clipping doesn't occur at the disk file data storage representation and you'll get the chance to control and overcome those clipping artifacts later on in the process chain eg. when ultimately rendering to DAC/soundcard, through simple attenuation (ie. volume/fader/whatever;))
re. 2) PIANO ROLL - QUICK-SAVE
pressing Ctrl+S while the MIDI clip editor is up just saves the MIDI file that you're working on that precise MIDI clip, not the whole qtractor session (or, if you prefer, project or song);
pressing Ctrl+S while the main window has focus is the way to save the whole show.
you might find it wrong, redundant or even confusing, but yay, that's the way it works :) unless, i'm missing the point or something in between :/
re. 3) TEMPO MAP/MARKERS NOT RESTORING
this needs more investigation; what exactly is not restoring and when? is it easily reproducible or just happens sometimes and hard to remember what and when?
make sure you get all comments from ticket #63: as repeat ad-nauseum: tempo/time-sig changes must only occur at bar measure positions; there's no way to work around that, i am sorry :) and tempo ramps are not supported either; use the timeshift MIDI tool to emulate accelerando/retardandos on individual MIDI clips, it's not possible to do it any other way, any time soon. sorry.
cheers
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