Saving to file is the same whether using ASIO + EMU 1616m or Java with various sound cards. It's a Windows 11 system. I can dig a little deeper into it if you're unable to reproduce this.
Generator / Save to file / Format 24-bit PCM. RTA / Open WAV. The other bit-depth options are clean.
ASIO...
[REW V5.20.4]
The signal is from the REW generator, 997Hz 0dBFS sine at 24-bit PCM 48kHz, dithered at 24 bits. There's an even order harmonic distortion in this spectrum that is not ideal. I don't see the problem in 16-bit or fp32 signals.
These are good. 16-bit dithered at 16 bits and...
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