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Re: ABSN reversed playback behavior

From: Matthew Paradis <matthew.paradis@bbc.co.uk>
Date: Mon, 13 Mar 2017 21:58:18 +0000
To: Joe Berkovitz <joe@noteflight.com>, Raymond Toy <rtoy@google.com>
CC: Hongchan Choi <hongchan@google.com>, Audio Working Group <public-audio@w3.org>
Message-ID: <6C565BFF-7D71-47A8-A028-89865E577405@bbc.co.uk>
Late to the party but I would agree with this.  Option (2) does make more sense to me. Great to see this slowly becoming clear!

--
Matthew Paradis
Senior Software Engineer (Audio),
BBC Research & Development
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From: Joe Berkovitz <joe@noteflight.com>
Date: Thursday, 9 March 2017 at 21:55
To: Raymond Toy <rtoy@google.com>
Cc: Hongchan Choi <hongchan@google.com>, Audio Working Group <public-audio@w3.org>
Subject: Re: ABSN reversed playback behavior
Resent-From: <public-audio@w3.org>
Resent-Date: Thursday, 9 March 2017 at 21:56

At this point, based on the survey of what actual samplers do, I feel like the expected behavior should be as you and Hongchan have argued: that the loop "traps" reversed playback.

I amended the current PR to reflect this last week, so you should now see the wrapping behavior that you expect (and I won't continue arguing that it should be otherwise!)

.            .       .    .  . ...Joe

Joe Berkovitz
Founder
Noteflight LLC

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Somerville MA 02144
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"Bring music to life"
www.noteflight.com<http://www.noteflight.com>

On Thu, Mar 9, 2017 at 12:52 PM, Raymond Toy <rtoy@google.com<mailto:rtoy@google.com>> wrote:
Is there a conclusion or consensus on this?

I've been holding off reviewing the PR for this until we have a consensus on what the expected behavior is.

On Fri, Mar 3, 2017 at 12:35 PM, Joe Berkovitz <joe@noteflight.com<mailto:joe@noteflight.com>> wrote:

I spent a good chunk of my life with Max/MSP and I can tell the groove~ supports negative playback rate with looping. The reference might be incorrect - I just downloaded 7.3.3 and confirmed again; groove~ supports the negative playback and it runs like option (2).


That is very good to know.

> Apple Logic X Pro (one of the most popular DAWs): loops are ignored when "Reverse" option is selected on an instrument zone (verified by trying it)

From your mention of "an instrument zone", I believe you meant EXS24 sampler. The new Alchemy synth/sampler actually supports the reverse looping.

Thanks, I don't know Alchemy very well yet. When it plays backward, does the playhead get "trapped" inside the loop?

FWIW, Max/MSP's groove~ is the closest thing to our ABSN. We don't have to follow but I believe that's what most computer musicians (including myself) are expecting.

Again, that's a great data point to have.



Received on Monday, 13 March 2017 21:58:52 UTC

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