This does the intermodulasjons distortion calculation for you.
I don not find the Ultimate test record VtA track useful … it is in stereo=45 degree modulation while VTA check must be vertical modulated ( mono out of phase)
'Script for intermodulation distortion testing of vinyl playback, setting VTA ,Zenith etc by test record'
https://www.audiosciencereview.com/...-setting-vta-zenith-etc-by-test-record.66496/
I don not find the Ultimate test record VtA track useful … it is in stereo=45 degree modulation while VTA check must be vertical modulated ( mono out of phase)
'Script for intermodulation distortion testing of vinyl playback, setting VTA ,Zenith etc by test record'
https://www.audiosciencereview.com/...-setting-vta-zenith-etc-by-test-record.66496/