so close, but not close enough. Reducing further.

lib/ZuluSCSI_platform_RP2040/audio.h

@@ -27,7 +27,7 @@
 // size of the two audio sample buffers, in bytes
 // these must be divisible by 1024
 // #define AUDIO_BUFFER_SIZE 8192 // ~46.44ms
-#define AUDIO_BUFFER_SIZE 6144 // reduce memory usage
+#define AUDIO_BUFFER_SIZE 4096 // reduce memory usage
 
 /**
  * Handler for DMA interrupts