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In the 80s and 90s some higher end consumer VCRs did have manual audio level controls.
If recording off the tuner AGC could potentially affect the audio but going through the AV inputs there would be separate gain control circuits for audio and video...the tuners demodulated AV would probably also pass through the same recording AGC circuits as the AV input jacks do thus reducing any level problems in the tuner audi (the video would be disturbed by Macrovision in both systems).
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