NUSofting

liqih · Post by **liqih** » Thu Mar 12, 2009 4:31 pm

Here is an unofficial Demo VST plugin for Windows:
http://www.nusofting.liqihsynth.com/zip ... indows.zip

Demo Restrictions:

The free downloadable Demo of the Prima Delay has these limitations:

1) Saving the state (presets) is disabled
2) The audio output mutes after about 20 minutes of usage, then you need to unload and reload it to enable audio output again
3) Each 35 seconds a gentle bell plays thru the audio to remind you the demo mode.

The say software can not have no bugs.
So you can win one license of Prima Delay.
A free license (Mac and Win) is available to anyone who can find a meaninfull bug in the plugin.

please check the Manual
http://www.nusofting.liqihsynth.com/zip ... 20Help.pdf

Thanks

Juanjo · Post by **Juanjo** » Thu Mar 12, 2009 4:50 pm

Well, there's something which looks to me like an obvious bug: with short base times, I sometimes get the whole chain of taps once (as expected), but other times I get the whole chain of taps several times with decreasing amplitude, as if an extra, slower delay was applied to the wet output.

I still haven't found the cause of this behaviour though, or maybe I'm missing something here and it's a simple (dumb) user error?

Steps to reproduce:
1. Load the plug, load a preset with short base time i.e. Frigo resonance
2. Feed the plug with very short audio (i.e. a short snare without decay) -> the defined chain of short taps is reproduced once
3. Now feed the plug with longer audio (i.e. a drum loop) -> the defined chain of short taps is repeated several times with decreasing amplitude (?)
4. Wait a bit (maybe to clear buffers?) and repeat step 2 -> you get the expected behaviour (chain of taps reproduced once) again

This is on a puny pentiumM laptop running energyXT 1.4 under WinXP SP2...

Otherwise the plugin looks nice and able to produce a wide variety of cool effects, good job.

*EDIT*: Reproducible in Phrazor as well.

liqih · Post by **liqih** » Thu Mar 12, 2009 5:08 pm

Hi,

Thanks for the quick report!

"Frigo resonance" preset has a short base time but a slow deep modulation by the LFO, the Feedback is at max negative (-100%), this should explain the beaviour,
if you turn LFO Depth to zero, you should have no variable feedback

Juanjo · Post by **Juanjo** » Thu Mar 12, 2009 5:19 pm

liqih wrote:Hi,

Thanks for the quick report!

"Frigo resonance" preset has a short base time but a slow deep modulation by the LFO, the Feedaback is at max negative (-100%), this should explain the beaviour,
if you trun LFO Deptth to zero, you should have no variable feedback

Ah OK I get how it works now, thanks for clarifying... but the problem is still there at LFO Depth=0, I mean I don't get variable feedback but EITHER correct feedback OR no feedback. Particularly if I feed silence to the plug for a bit and then I feed it with short audio snippets, the feedback doesn't seem to "kick in", it's only after I feed "longer" incoming audio that the feedback starts working as expected again...

EDIT: Also there seems to be some kind of denormal issue going on... generally cpu usage is higher with silence than with audio at the input (?), plus my machine seems to handle this preset (Fringe Resonance) just fine but if I set LFO Depth to zero after a while it maximizes cpu usage and doesn't get back to normal even if I stop feeding audio to the input: I have to reload the plugin.

liqih · Post by **liqih** » Thu Mar 12, 2009 5:31 pm

feedback in Prima Delay somehow depends on the lenght of the input, but I'll check better later what you say,

that LFO Depth to zero = max CPU sounds like a bug I left behind, I check now

liqih · Post by **liqih** » Thu Mar 12, 2009 5:38 pm

confirmed bug : LFO Depth to zero = increased CPU usage...
one more denormal issue missed,

Congratz Juanjo you won your license,

Juanjo · Post by **Juanjo** » Thu Mar 12, 2009 5:42 pm

liqih wrote:feedback in Prima Delay somehow depends on the lenght of the input, but I'll check better later what you say,

Ah, then the problem seems to be that sufficiently short bursts of audio at input don't "trigger" any feedback at all, if preceded by a long enough silence.

liqih wrote:that LFO Depth to zero = max CPU sounds like a bug I left behind, I check now

Yep it's weird, maybe not denormals though as I can't correct the issue with GVST's GNormal (which usually works). Let me know if I can provide any further info.

EDIT: just saw your comment above, so it WAS denormals then

liqih · Post by **liqih** » Thu Mar 12, 2009 6:02 pm

not audio denormals, but on parameter

Demo updated, same link, now it should not burn CPU
http://www.nusofting.liqihsynth.com/zip ... indows.zip

Juanjo · Post by **Juanjo** » Thu Mar 12, 2009 6:34 pm

liqih wrote:Demo updated, same link, now it should not burn CPU

Confirmed, issue fixed here.

ZombyWoof · Post by **ZombyWoof** » Thu Mar 12, 2009 7:07 pm

I like this effect. Lots of sweet possibilities.

When unloading the plugin under Live 8 Beta in WinXP SP2, I get a message 'Can't load bank, wrong file size'.

liqih · Post by **liqih** » Thu Mar 12, 2009 7:11 pm

Thanks ZW, the message is for Live does a check of the plugins state at each unload, now I'm gonna check that issue

liqih · Post by **liqih** » Thu Mar 12, 2009 7:21 pm

Tried in XP SP3 and Live 7, no message deleting the plugin, could it be a a Live 8 Beta issue to report to Ableton?

ZombyWoof · Post by **ZombyWoof** » Thu Mar 12, 2009 7:29 pm

liqih wrote:Thanks ZW, the message is for Live does a check of the plugins state at each unload, now I'm gonna check that issue

The error happens each time I unload the plugin in Live 8 Beta 17. In Live 7.0.14, it is not as evident, but it does happen when I delete the plugin from a track and then undo the deletion.

liqih · Post by **liqih** » Fri Mar 13, 2009 12:27 am

yes I found it, so it's the Undo feature of Live over the Demo of Prima Delay to do that, as you know the Demo doesn't save presets, but the Undo to work needs to save the plugin state. So I could simply say that the Demo of Prima Delay done's not support Undo, or force the Demo to save a dummy bank file so that Live is happy to have something to reload.

The difference to Live 8 seems that now it checks in advance if the plugin can reload by Undo.

ZombyWoof · Post by **ZombyWoof** » Fri Mar 13, 2009 5:39 am

liqih wrote:yes I found it, so it's the Undo feature of Live over the Demo of Prima Delay to do that, as you know the Demo doesn't save presets, but the Undo to work needs to save the plugin state. So I could simply say that the Demo of Prima Delay done's not support Undo, or force the Demo to save a dummy bank file so that Live is happy to have something to reload.

The difference to Live 8 seems that now it checks in advance if the plugin can reload by Undo.

Good catch. Not really a bug then, but a path to deeper understanding.

NUSofting

KVR Audio

Prima Delay unofficial Demo VST plugin for Windows ready