[iandcoleman]

'low_latency' used to be sub 20ms, however 'professional' was introduced a while ago to replace this, with 'low_latency' becoming 40ms

[iandcoleman]

Sorry, Actually, it's 45ms. From the docs: android.hardware.audio.low_latency indicates a continuous output latency of 45 ms or less. android.hardware.audio.pro indicates a continuous round-trip latency of 20 ms or less