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Sample buffer audio content wiped on save (live.ppooll in Ableton) #181

Description

@dylanbjohnson

Description:
When saving, the recorded audio content in a buffer_host sample buffer is wiped, even though the buffer allocation and references are retained.

Steps to reproduce:
Run ppooll (live.ppooll device inside Ableton)
Create a sample buffer in buffer_host (e.g. 60000ms, stereo)
Record live audio into it via buffub
Load flop and gg.rainer, both reading the same buffer — confirm playback works
Either save the Ableton set, or use "write environment" (W) in ho_st

Expected: The buffer retains its recorded audio content after saving.

Actual: The buffer's audio content/waveform is wiped. The buffer (e.g. sb0_60000_2) is still selected in buffub, flop, and gg.rainer, and still shows the correct length (60000) in buffer_host — but the waveform is empty and there's no audio to play back.

Notes:
Happens on both Ableton set save AND ppooll "write environment" (W)
The buffer allocation persists (correct length, channel count, and act references retained); only the recorded audio content is lost

Environment:
ppooll v9.1.0-beta-260418 (live.ppooll device in Ableton)
Max 9.1.3
macOS 14.6.1, Intel MacBook Pro

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