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This can be done by disabling the erase head. For example disconnecting it.
Then it works like painting. Sound and be added on previously recorded sound. Some loss is only apparent on the first 2 or 3 passes for each layer. But it still remains original, there is no copy or overdub.
How do we monitor the music already recorded so that we can add more?
A way can be to use the (unused) erase head as a playback head. It has a wider airgap so there would be some treble loss in playback. A separate equalized preamplifier must be connected to it. And a small time delay should be added as the erase head is read first (it predicts the future, or more correctly the rec head lives in the past) as the tape will first pass through the erase head and then through the rec head.
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