Re: [SoX-users] Mixing in a repeating track into a song

[Wojciech K. <web...@wo...>]

Thank's for your reply robs, it's been very helpful. I still have some 
questions though..

> Lector: assuming lector is about 10secs, then use
> 
> sox lector.wav rand-lector.wav speed $rand1'c' rabbit allpass $rand2 $rand3
> 
> where $rand is obtained from a random number generator, between say -200 and
> 200, e.g. 123.456789.  And $rand2 & $rand3 are also random numbers suitable for
> the allpass effect.

   As for $rand1 - I experimented with the values you suggested and this 
range seems a little too broad to me. I don't know, maybe it was the 
sample I used, but it sounded a little ridiculous when i got to more 
than +50, or less than -50.. Could sticking with such a small range 
cause significant problems (as opposed to using -200:200) ?
   As for $rand2 and $rand3 - I read about the allpass effect in the sox 
man page and the link provided there, but I honestly don't get any of it 
;] Any suggestions as to these ranges ?

> Then you could use
> 
> sox rand-lector.wav 5min-lector.wav pad 10 10 repeat 9
> 
> to get your 5 minute file with lector roughly every 30 secs, though it would be
> much better to use a fresh rand-lector.wav for each repeat---see the soxexam
> manual page for hints on how this can be scripted.

   I could just generate multiple rand-lector files and concatenate them 
into one 5min-lector - is that what you meant ?

> Mixing will reduce the volume of the track, this can be constrained to just the
> points during which the lector is active by using compand with sox -m.

   The compander proved to be no less esoteric, than the allpass filter 
;] I tried reading the wikipedia entries for both, but that didn't help 
a lot, so once again any hints would be very much appreciated..

> I would recommend using a low bitrate for the demo songs (e.g. ogg level 1 or
> 2) just to keep your net bandwidth down.

   I was thinking of streaming mp3 and ogg in two qualities - 128 and 
192 for mp3 and as for ogg, I haven't really decided yet - I have little 
experience with this format. These mp3 qualities are roughly equivalent 
  to ogg level 3 and 4, aren't they ?

> Please donate your SoX scripts back to the SoX project if you get them up and
> running; they would make an interesting example for others to learn from.

   I'll share my scripts as soon as they're done. Should I send them to 
this list ?


cheers,
Wojtek