Running Audacity 3.0.4
On Windows 10
I recorded some audio from a Polish church music cassette with some acapella songs and some accompanied with a guitar or organ. One song even has a piano at the beginning and end. For many songs, especially on the left audio channel, the volume oscillates every 3 seconds near the beginning and every 1.5 seconds near the end. It quickly lowers in volume by about 24 db. I have heard that using compression would help solve these problems, but of course, I would like input on the matter, since I’m still not very good with using compression.
The full cassette: https://drive.google.com/file/d/170uyD8fOwXPh4BMluMcThf3YK30JxbcN/view?usp=sharing
Example near the beginning of Side B with slow volume oscillations: https://drive.google.com/file/d/15z1uKrd6Vu0MBT3OnPISpZWcqmOgUD7-/view?usp=sharing
Example at the end of Side B with quick volume oscillations: https://drive.google.com/file/d/1d4hxma0N1APHj3G1ZgQhUBINTiCdFKgr/view?usp=sharing
0:00 of the full cassette is Side A, 31:15 is Side B
I will say that halfway through Side A (about 17:48 into the full cassette), the audio is fine, so no editing is required there, but Side B and the left audio channels are the ones where the problem is most glaring.
I did apply the Low Rolloff for Speech EQ setting to minimize cassette rumble.