Thanks for the info Vari-mu, I might have to give Maurizio's facility a try one day.
30 locked grooves on one side? How on earth would you calculate that?
I saw a 2-track per side Kevin Saunderson release many years ago where the outer track played inwards, but the inner track outwards.
edit: Just found the site for Dubplates+Mastering in Berlin.
Taken from:
http://www.dubplates-mastering.com/faq.html Quote:
2.9 How should material for loops (lock grooves) be prepared?
The tempo must be exactly 133 1/3 bpm in order to fit a 4/4 bar onto a 33 1/3 rpm loop -
that is the loop must be 1,8 seconds long.
The tempo must be exactly 180 bpm in order to fit a 4/4 bar onto a 45 rpm loop -
the loop must be 1 1/3 seconds long.
We need a piece of the looped material , about 15 seconds long.
We can also prepare the material, if required.
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Cheers,
Justin