at = _trackview.audio_track(); /* we know what it is already */
framepos_t const frame_pos = at->current_capture_start ();
gdouble xstart = _trackview.editor().sample_to_pixel (frame_pos);
at = _trackview.audio_track(); /* we know what it is already */
framepos_t const frame_pos = at->current_capture_start ();
gdouble xstart = _trackview.editor().sample_to_pixel (frame_pos);