oddball ADAT transfer scenario

[EMRR]

ADAT tape formatted at 48K, but pitched down -300 to extend recording time on a live show.

You may recall ADATs have a pitch adjustment in cents, with -147 on a 48K format being 44k1.  Once Alesis allowed formatting at 44K1, you still couldn't use that if you had a BRC, you had to stick with 48K pitched down and label everything with the info.

48,000 - 44,100 = 3900 = -147 cents
3900 / 147 = 26.5306122
26.5306122 x 300=7959.18367
-300 = 40,040.81633 kHz. Good guess.

Import at 48K, change headers to 40,041kHz without converting, then sample rate convert to 48K. Better sound to do it this way, versus an analog transfer, skip the ADAT DA section.

I had a CD-R reference mix from back when for comparison. The math looks good, but the result is too slow. Speed change versus rate must be non-linear. 40,384 is slightly slow, closer than 40,385 which is slightly fast. DP won’t do a decimal, it rounds up.

Party on!

[EMRR]

OMG another one - something recorded at +100. Written with it is “50.8kHz” which does sound like something I’ve seen before. This did convert properly with that header change.

[mikehalloran]

DP’s implementation of ZTX is less than ideal. In TwistedWave, using ZTX, I can re-pitch to 1 cent and time-stretch to .01 seconds — simultaneously or independently.

[joelfriedman]

Hey Mike. Is this the TwistedWave you’re referring to? Subscription? I’m wondering for quick editing stuff for teaching whether it makes sense to use this vs Snapper and/Audacity, not to mention the pitch & time stretch you seem to like.

https://twistedwave.com/store/order_desktop

Sent from my iPhone using Tapatalk

[EMRR]

This speed diff is far less than 1 cent, a fraction of a millisecond comparing 0:00 to 10:00. Analog tape would be multiple orders of magnitude worse, for example.

[mikehalloran]

This speed diff is far less than 1 cent, a fraction of a millisecond comparing 0:00 to 10:00. Analog tapr would be multiple orders of magnitude worse, for example.

Pitch is measured in cents — 100 = 1/2 step. For kicks, I asked TwistedWave to change pitch of a sound file by .001 cent i.e. 1/10000 of a half step. No problem.

Pitch.png (117.77 KiB) Viewed 4630 times

You can change time either as a percent or in seconds—your choice. You can also do both by checking the Lock... box.

Speed.png (609.64 KiB) Viewed 4630 times

[mikehalloran]

Hey Mike. Is this the TwistedWave you’re referring to? Subscription? I’m wondering for quick editing stuff for teaching whether it makes sense to use this vs Snapper and/Audacity, not to mention the pitch & time stretch you seem to like.

https://twistedwave.com/store/order_desktop

Sent from my iPhone using Tapatalk

Although he calls it Subscription, the $99 price (or 12 months of subscription) includes a permanent license and updates for one year. If you continue, there's a discount for the second year and a third discount for subsequent years. I first bought it around 2008 or so and when I needed to upgrade last year, was offered that 3rd year discount.

There's a video and speech enhancement add-on that I have. I've not used the speech but the video lets you edit audio and your video clip follows the edit. It's a basic edit that you can do in any AV app but it's pretty slick that with TW, you only have to edit the audio. You've seen this in a ton of YouTube videos.

TwistedWave is an audio editor. It has a little DAW functionality but not much. Not only can it convert just about any format to another but it does everything quickly. It can also batch-convert many file types with multiple folder destinations simultaneously. An example: once I did a BTD of a 2 hour live stereo track to mp3 — in DP, this took nearly 50 minutes because of the conversion. By bouncing the file to .wav in DP first, then converting to mp3 in TW, I shaved about 45 minutes off the task. Absolutely well worth the money, IMO. It's now available for Windows, too.

https://twistedwave.com/

The iPhone/iPad versions are not nearly as powerful. They can load a file in a fraction of a second and keep my performance files far better organized than iTunes/AppleMusic, however.