I dare say a run to Cam at old jaguar in Sydney would sort your problems out, or at the very least, diagnose the issue.
Going for a long shot - have you tried resetting the car, by removing both battery cables and touching them together? I haven no idea what audio settings are stored in permanent vs volatile memory in the car, but if there is some corruption in a setting somewhere (like, the tone being ****ed up, even though you are setting it correctly in the head unit) that might bring it back in line?
2010 TDV6 3.0L Discovery 4 SE remapped to RRS output, Alaska White, GME XRS-330c, IIDTool BT, Dual Battery, Apple CarPlay, OEM Retrofitted: Cornering lights, Door card lights, Power + Heated Seats, Logic 7 audio
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