synth: pin output stream buffer to 1024 frames#383
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The previous config path produced BufferSize::Default, which on shared-server backends like PipeWire/JACK adopts the host's current quantum. Opening pro-audio applications (e.g. Bitwig) drops that quantum for low-latency monitoring, which caused Neothesia's stream to underrun and glitch. Request a Fixed buffer clamped to the device's reported SupportedBufferSize range. Fall back to Default when Unknown.
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On shared-server audio backends (PipeWire/JACK),
BufferSize::Defaultadopts the host's current quantum. Opening pro-audio applications (e.g. Bitwig) drops that quantum for low-latency monitoring, which then causes Neothesia's stream to underrun and glitch. Requesting a fixed buffer decouples Neothesia from whatever quantum the server is currently running at.