The original issue (about audio being the wrong length) I have put down to different measuring of the NTSC media, on a PAL timeline.
ie. My timeline expects 25fps but gets vision at 30fps. When you put in a strip of 300 frames, what was 10secs worth of vision @ 30fps becomes 12secs @ 25fps. Hence the longer clip (just slower playback). The Audio strip was shorter because it doesn’t run at frames per second (fps), rather at samples per second. So it stayed the right length, strange that they dont remain locked tho’.
I am trying to translate footage from NTSC (still camera footage) to PAL for editing against other PAL originated footage. Most apps just drop 5 frames every second and you get appaling strobing from it. Blender allows some frame blending o soften the truncation of frames.
Unfortunately the speed effect in sequencer doesnt seem to allow much interaction to change blending or frame stacking values to soften it further.