I stumbled across a method for greatly improving the frequency response of these older programs I made several years ago. Any recording medium that uses a motor for playback will suffer from some level of wow and flutter. This is fluctuations in the playback speed of the motor, which result in a ‘wobble’ of the audio’s pitch and speed. The problem is that this throws off the program used to sample things for Nebula- NAT.

When it tries to ‘deconvolve’ a tone sweep down into an impulse, the fluctuations caused by the wow/flutter are recognized as phase shifts in the frequency response by NAT. This leads to the tell-tale ‘jaggy’ response seen in any program sampled from a recording medium with a motor. With a good Reel to Reel deck the jaggyness can be very subtle, but if you zoom in with a good analyzer you should  still see it. When it’s that subtle, it’s not a problem! Cassette decks usually have worse wow/flutter due to the motor speed being slower, so with these programs the jaggyness was actually audible in some cases, manifesting itself as a subtle ‘brightness’ added to the character, which wasn’t supposed to be there.

I’ve found a way to fix it, and the responses look and sound sooo much nicer now! There were *many* other improvements to the programs in the library, with an over-all result being, in my opinion, that this is basically a new thing. I think the potential for use has been greatly opened up.

Below are some before and after comparisons of some of the programs in the library, so you can see how the frequency response has been improved. These graphs don’t show how the dynamic behavior is also greatly improved in this library!

Old responses on left, new ones on right!

This is tape #3, Maxell UR. It’s a type 1 tape.

Here’s program #5A, a Maxell XL II which is a type 2 tape.

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This is program #5B. It’s the same Maxell XL II tape, but this one was played/recorded at a slower speed while sampling.

Program #11A, a Maxell MX-S which is a type 4 metal tape. This one is great for a more subtle effect due to having the least high freq roll-off up to 20khz out of the set. The best program for that purpose. Still gives some of that tape crunch in the dynamics.

Program #12A, a TDK-MA type 4 metal.