3.5-246 is the version that did away with the 32 kHz sampling rate, saying, "Removed the Sample Rate setting. It is now hardcoded to 48000hz (accurate audio timing)."
I can confirm that Mario Party 4, a game I read for sure uses AX UCode and which uses mostly sequenced music rather than streamed, still synthesizes frequencies above 16 kHz, whether HLE or LLE, on both sequenced and streamed music. The streamed music is at 32 kHz as well.
I can confirm that Mario Party 4, a game I read for sure uses AX UCode and which uses mostly sequenced music rather than streamed, still synthesizes frequencies above 16 kHz, whether HLE or LLE, on both sequenced and streamed music. The streamed music is at 32 kHz as well.