There are other forensic time stamp signals besides bias which would  
allow for an ATR-100-recorded tape to be de-fluttered by the PP  
DSP.   However, even though a tape may be played back by the Airshow  
ATR-100, it's entirely possible that the tape was recorded elsewhere  
by a different machine (having a much lower bias f).  I believe that  
Airshow are offering this service with PP for already-existing analog  
tapes, rather than for creative layback transfers.

David Glasser is chief engineer at Airshow and he has mastered a huge  
amount of audiophile CDs, DVDs, and SACDs.   Great ear; great rooms;  
great gear.

  From the PP website:

"software algorithm, developed with researchers at Cambridge  
University in England, which identifies a steady-state ultrasonic  
reference tone (such as tape bias or logic control) embedded within  
the original analog signal and then performs continuous high- 
resolution pitch correction in order to keep the reference tone at a  
fixed frequency..."


On Apr 29, 2010, at 4:15 AM, Shai Drori wrote:

> My experience with the ATR is just the opposite. I have tested  
> various transport and some tapes were handled only by the ATR. Does  
> the system figure out bias frequency automatically. What does it do  
> with tapes recorded on the atr where the frequency is so high it  
> doesn't show up on playback (400kHz+)?
> Shai
> On 4/29/2010 8:54 AM, Paul G Turney wrote:
>> Well they only use ATR 102 machines which are notoriously rough  
>> tape handlers....
>> They use software to track and maintain a bias frequency so that  
>> any speed anomolies are and wow and flutter are reduced by  
>> maintaining perfect pitch with this tone.
>> Not worked with Airshow mastering.
>> It appears to be a monopoly on the software so Airshow would be  
>> subbing the work out to PP.
>> PT
>> -----Original Message-----
>> From: Chandra Lynn [mailto:[log in to unmask]]
>> Sent: Thursday, April 29, 2010 02:12 AM
>> To: [log in to unmask]
>> Subject: [ARSCLIST] Airshow Mastering&  Plangent Processes
>> I noticed some earlier postings about Plangent Processes. It  
>> eliminates wow,flutter and speed aberrations from analog masters.  
>> They are now working withAirshow Mastering to offer optimized tape  
>> transfers. The announcement is onAirshow¹s site at http:// 
>> any of you worked with  
>> Airshow or Plangent? If so, what has been yourexperience?