fixed scope and meter accordingly to properly update data and size.

at any given point, so that changes to the audio subsystems can
be applied live(needed for jack).

this is also usefull in that it can give the ability for a Reset
button on the toolbar along side a play/pause button for being able
to at any point completely kill audio and reset to begining(usefull
for recording takes where you want it to start at specific point w/out
the delays echos etc overlapping for the first iteration.