Hi everyone!
Today I let a cleaning cassette run through after I finally got one but it did not help a lot at all.
I tried it with some cleaning alcohol and no result either.
What other reasons can there be for a muffled sound?
It is only on tape deck 1, tape 2 plays perfectly.
Today I let a cleaning cassette run through after I finally got one but it did not help a lot at all.
I tried it with some cleaning alcohol and no result either.

What other reasons can there be for a muffled sound?

It is only on tape deck 1, tape 2 plays perfectly.