Re: Re: au88x0_synth

[Manuel Jander <manuel.jander@usm.cl>]

Hi,

On Wed, 2005-03-30 at 16:04 +0800, Raymond wrote:
> http://www.alsa-project.org/~frank/alsa-sequencer/node12.html
> 
> The midi port only need to support 16 voices, the 16 sample rate
> convertors are just enough to produce 16 voices using the mono sound
> samples in the soundfonts au30gm.arl

Yes, but the ADB engine is intended for normal wave playback. The WT
engine is more suited  for Wavetable stuff. It also has some envelope
filters and such for effects. With only 16  voices, you will run out of
them pretty fast (overlapping notes).

> In snd_vortex_playback_hw_adb, .rates = SNDRV_PCM_RATE_CONTINUOUS
> 
> 1) Can the sample rate convertor be used to perform pitch shift ?

Yes.

> 2) Can panning be done by changing the mixin-mixout gain for left/right
> channels of each voice ?

Yes, but again, we should better use the WT processing block which is
there for that purpose.

> The current alsa driver do not even use the timer VORTEX_SMP_TIME or
> timer interrupt VORTEX_SMP_TIMER
> 
> 3) Is there any way to find out the resolution of the timer ?

Yes. Measuring it :)

Best Regards,
-- 
Manuel Jander
Dipl.-Ing. Fachrichtung Elektronik



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