cleanest vari speed

[FroTools12]

Hi all.

I am in the process of archiving some old analog tapes to daw.

They were recorded at 30 ips. My friend baked them and is transferring at 15 ips, the format of his Revox.

Not a problem, I know I can easily double the speed. As long as I don't mess with the pitch/time correlation.

Planning on using the "Time Shift" from audio suite. Just to make sure I'm on the right track, I figured I'd do a little test.

I took some material from a well recorded cd. Duplicated the track, and threw the duplicate out of phase. Signal disappeared.

Next, I took the original, and brought it to half speed, to simulate my reel, as follows:

Finally, I doubled the speed to get it back to normal, as follows:

I figured if it went perfectly, my two tracks should still cancel each other out. They don't.

I mean, the track that got slowed down and sped back up sounds amazing and through my nice Sony headphones I can't tell the difference. Am I doing it wrong or just geeking out too much?

Fro