[sdiy] High Q Resonators/digital drums

[Andre Majorel]

On 2011-06-15 23:30 +0100, Richie Burnett wrote:
> >Thomas Strathmann wrote:
>
> >  That sounds eerily close. The most obvious difference to my
> >  ears (on cheap speakers at the moment) were the bass drum
> >  sound.
> 
> It's funny how different people hear different differences!  I think
> the hi-hats are the most innaccurately modelled voice, and sound
> quite different from the actual TR-808 I recorded.  I wasn't able to
> measure the frequencies of the 6 free-running pulse oscillators that
> form the basis of the cymbal sounds in the actual TR-808.
> Therefore, the DSP model for the cymbals is not as accurate as it
> could be.  There is quite a variation in sound between different
> Roland TR-808 machines though, and even a single unit drifts a lot
> with changes in ambient temperature!

The most obvious difference is the high-hat. It sounds much
more forward in the second half. Perhaps the closed high-hat
colours the perception of the bass drum underneath.

If the TR-808 has op-amp buffers, their limited slew rate might
make a difference.

-- 
André Majorel http://www.teaser.fr/~amajorel/