linuxaudio.org

On Sun, 8 Apr 2012 15:23:50 +0200

David Adler  wrote:
> On Sun, Apr 8, 2012 at 10:40 AM, Fons Adriaensen wrote:

quoted text
> > On Sat, Apr 07, 2012 at 11:57:57PM +0200, David Adler wrote:

> >

> >> My experience with Yoshimi (under Linux) is excellent,

> >> Zynaddsubfx tended to produce dropouts/clicks and

> >> sometimes exited from Jack, back when I used it.

> >

> > Another beginner's problem: whatever instrument I select,

> > there always seems to be a second one active: it produces

> > a short 'ping' with a repeat echo on it, and seems completely

> > unrelated to the patch I actually want. And I can't get rid

> > of it...

>

> I don't here such a 'ping' on all patches, but I do recall having

> had hard times trying to get a smooth sounding attack, despite

> sufficiently long attack times.

>

> When starting yosh without any instrument/parameters, there

> are clicks/plops/pings on note on. Not surprising of course,

> due to the short default amplitude-attack times and near sine

> default waveforms.

> What I do notice is that for SUBsynth, increasing attack time to

> a value of ~10 is sufficient to remove note-on clicks for even

> moderately low frequencies, as should be expected if the unit

> is [ms]. For ADDsynth and PADsynth in contrast, a value of >35

> just barely silences the somethat 'plop'-like attac sound.

> The same for release times.

> Naively asking my ears, I'd say those plops are not tied to the

> attack ramp of the env, the ramp just decreases the volume of

> some plop, irrespective of the note frequency.

>

> I find this not to be audible (or perceived as part of the

> characteristic attack spectrum) for most patches with

> significant HF content.

>

> This is no different in Zynaddsubfx.

> Not sure about any repeat echo.

>

>

> best,

> d

I've just done a quick and dirty test of this with quite interesting results.

For a short while I have two files on my website:
http://www.musically.me.uk/Attack_Test_0mS.mp3

and

http://www.musically.me.uk/Attack_Test_15mS.mp3
These were recorded using yoshimi and the default AddSynth sound simply

triggered with the virtual keyboard. Unfortunately, I don't have time to cross

check with subSynth at the moment :(
If you look at them with audacity and at a very stretched scale, you will see

that they all start with a negative going half-cycle and there is absolutely no

offset, and no significant distortion. Therefore the seeming pulse sound is a

purely psycho-accustic effect.
The 15ms attack ones are more interesting as they show a nice increasing

amplitude at low pitches (which sounds nice and smooth) but that rapidly

dissapears as you go up in pitch. This I would suggest is a bug in the

implementation - apparently true of both zyn and yoshi. 15mS attach should

*always* be 15mS.
I don't usually cross-post but I think this will be of significant interest on

the yoshimi list.
--

Will J Godfrey

http://www.musically.me.uk

Say you have a poem and I have a tune.

Exchange them and we can both have a poem, a tune, and a song.

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