It doesn't work on any single frequency. It needs a range of various non-harmonically related tones to determine what is program and what is wow. There is no feature that I've seen for tracking 60Hz. ReSpeed offered this, and it's in direct patent violation, but not worth pursuing, and it didn't work anyway. To quote Dave Gamble "For DSP life sucks under 100Hz". Gross wow Capstan is sometimes OK at, but introduces a lot of chirps also. I've used it on a few things when requested to do so, where I can divine its control track and use our pitch shifter with it, which isn't trying to work in real time. By this method we can filter out their errors directly, but there's a lot of stuff it misses. An out of tune piano unison will drive it batsh*t.
If you want a disappointing and cautionary experience feed it a DDD source and look at the control line. It's trying to correct a lot of stuff that isn't wow or flutter, thereby causing wow and flutter.
Another issue is that it puts everything on a chromatic western scale. I was hired to fix a 35mm vinegar of a WW1 aerial dogfight scene and it converted a wowed but linear "augur in" plane crash whine into a very nice chromatic run Arthur Rubenstein would have been proud to execute.
> On Jul 13, 2017, at 10:30 AM, Steven Smolian <[log in to unmask]> wrote:
> As I recall, it's possible to limit the range of what Capstan works on to
> the 60 cycle area so if the hum is distinctive enough (or can be made so),
> then it should correct to a regular sine wave. It's less than super
> accurate but deals with gross errors with practice. It worked well on
> somewhat off-center piano records but this was a while ago. I've not had
> the occasion to sue it in some years. Perhaps they've improved their hum
> discrimination program subsequently.
> I just found the dongle, so I may upgrade and try it again when time allows.
> Steve Smolian
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of Jamie Howarth
> Sent: Thursday, July 13, 2017 10:19 AM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Seeking flutter correction bids
> Flutter - as defined by the NAB - is in a range that Capstan is
> intentionally band-limited out of since it's incapable of distinguishing
> flutter from vibrato.
> Please pardon the mispellings and occassional insane word substitution I'm
> on an iPhone
>> On Jul 13, 2017, at 02:35, Eero Aro <[log in to unmask]> wrote:
>> Jamie Howarth wrote
>>> Capstan doesn't work on flutter.
>> Hm. Has worked for me.