From the V5.20.6 release notes:
- Recent UMIK-1 (which have a USB-C connector) have a different volume curve, so the SPL figure shown for them was only correct at the 0 dB gain setting (54% volume on Win10). When an ASIO wrapper is used the volume control is bypassed for these mics, so the input volume correction should no longer be applied. REW now checks the mic serial number to determine the correction to apply.