[Ardour-Users] recording in half speed

Jari Suominen jari.suominen at helsinki.fi
Thu Jul 30 02:11:15 PDT 2009

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 

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.


> 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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