[Ardour-Users] recording in half speed

Patrick Shirkey pshirkey at boosthardware.com
Thu Jul 30 05:58:16 PDT 2009

On 07/30/2009 04:11 PM, Jari Suominen wrote:
> Patrick Shirkey kirjoitti:
>> Hi,
>> A couple of suggestions for you.
>> Record it at normal speed then time stretch it to fit the length of 
>> time you want it to play.
>> After the initial recording send the track through alsaplayer and 
>> adjust the speed with the adjustable speed slider. Then record the 
>> new track in ardour at 44100.
>> Mixing sample rates is probably gonna cause a big headache for your 
>> session so make sure all the tracks you use have the same sample rate.
> I have done these kinds of things with techniques like this but they 
> are a poor work a round for me as I can't play parts slower, and it is 
> a bit painfull.
> It would be sweet if I only could slow down the whole project so there 
> wouldn't be any excess hassle of editing and converting files in 
> different programs. My friends ancient sondcard ten years ago had a 
> simple slider for doing these kinds of thing on the fly.
> What would be super sweet would be way of recording in reverse speed.

Export the full session and play it with alsaplayer at a different 
speed. You can even play it in reverse.

Afaik ardour cannot playback in reverse speed and record in normal 
speed. just use an alternate app like alsaplayer to do the playback.


Patrick Shirkey
Boost Hardware Ltd

> ......j
>> Cheers.
>> Patrick Shirkey
>> Boost Hardware Ltd
>> On 07/30/2009 03:29 PM, Jari Suominen wrote:
>>> I would like to record some parts in project in half speed. Meaning 
>>> to slow down project in a way that all notes drop by one octave and 
>>> tempo slows down significantly. Like guitar solo on 'hard day's 
>>> night'. Then record some parts and return to normal speed to make 
>>> some grazy sounds etc.
>>> To me it seams that all I would need to do is to change the sample 
>>> rate of the project to 22050 for a recording phase and then switch 
>>> back to 44100 during playback. I know that there are soundcards that 
>>> are able to do this from hardware side, but mine isn't.
>>> I tried to run Jack with sample rate 22050 which would seem quite 
>>> obvious way of doing this. The message dialog shows that it is 
>>> creating alsa driver with 22050 as one parameter. However when the 
>>> server has started, the qjackctl shows still 44100 as sampling rate 
>>> and everything works as such. Wonder if this is bug or feature?
>>> Other playback speeds would be sweet too but I actually really only 
>>> need the half speed down which should not require any crazy time 
>>> streching etc. Only changing the sample rate during recording.
>>> Any suggestions?
>>> Best,
>>> ................j
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>>> Ardour-Users mailing list
>>> ardour-users at lists.ardour.org
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