[HNDen21]

I did this all the time... even used a double cassette deck to make copies... azimuth was the problem if the heads were aligned different.. so you used a small screwdriver and the top of the cassette had a small opening, this is where you had to align the heads by listening till it didn't sound distorted.. fun times

See also https://sqlservercode.blogspot.com/2016/11/what-was-first-co...

[makeset]

Then came a nifty upgrade called "LED control" which installed a red LED next to that screw so all you had to do was turn until it was brightest, significantly reducing ?LOAD ERROR. Good times.

[HNDen21]

Yep, there was also a program where a red line would be on your monitor and you had to turn the screw until the line was completely flat

[j_french]

From what I remember I had a decent amount of success copying games using a twin tape deck for my amstrad 464. I ended up passing on the amstrad to a colleague over a decade ago, who since moved to the US and is almost certainly on here. If you see this Jim, I found the manual!

[saltysalt]

Oh nice, I never knew about that!