Add bar-aligned silence padding to Octatrack tracks on sync#10
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Adds a -p / --pad flag to `wavesync sync` that pads each track with silence so its total length aligns to a multiple of 64 bars (Octatrack only, requires BPM metadata). Re-converts existing files when the expected duration changes. Lazy-evaluates BPM in Audio so TagLib is opened at most once per instance. https://claude.ai/code/session_01Qwfs9ncsZr2xiKxthYeAQU
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When syncing to the Octatrack, append silence to the end of each track so
that total duration (track + padding) equals a whole multiple of 64 bars.
64 is the Octatrack's maximum slice count, so this guarantees each slice
lands on a bar boundary regardless of how the operator divides the sample.
bar_multiple: 64to the Octatrack devicebar_multipleattribute loaded from configbar_multiple using 4/4 time (seconds_per_bar = 240 / bpm)
padding_seconds:and apply FFmpegapadfilter (
apad=whole_dur=<total>) when padding is neededpadding_seconds:through to transcode;treat non-zero padding as a reason to transcode even without a format
conversion
route through the converter whenever padding is required