EXS 24 Logic Sampler Users Group group photo

Yahoo Groups archive

EXS 24 Logic Sampler Users Group

Index last updated: 2026-04-28 23:25 UTC

Message

problem with LFO 1 EG?

2003-06-06 by timcosgrove_sf

Let me see if I can explain myself here. In LAMP 5.5:

If I use LFO 1 to control pitch, and I give a modulation value of +200 cents, and I use 
the up saw waveform for LFO 1, I get a change in value from the note played to 200 
cents plus. So for example if I play middle C I get a repeated slide up from middle C 
to D above middle C.

2 things are odd:

1. Is there any way to get the LFO to center around the pitch that's actually played? I 
would expect some way to create +/- 100 cents modulation around the center pitch, 
such that middle C played on the keyboard would result in a slide from B below 
middle C to C# above middle C. That way the perceived pitch is centered on the 
played note pitch. In my example above it sounds like I'm playing a C#, the center of 
C and D.

The triangle LFO wave does in fact center around 0, so 200 cents means 200 above 
and 200 below. But the two saws and two squares are both on one side of 0 or the 
other.

I suppose that I could get around this by transposing everything down a half step. But 
that isn't any good if the modulation depth of pitch by the LFO is itself changed. If 
there's no modulation, we're a half step flat of where we should be.

2. Even stranger: if I apply an EG delay to LFO 1, the note actually starts on B flat 
(i.e. 200 cents BELOW middle C) and then as the LFO kicks in, the whole things slides 
up to the C/D alternation described above. If I use decay instead, after the given time 
the pitch settles down to B flat.

This just seems flat-out like a bug, unless there's something about the modulation 
model I'm not getting or there's a preference somewhere that I've missed. Is this a 
feature or a bug? It seems to apply in both OS 9 and X. Or maybe this is corrected in 
6? Did anything change with version 6?

Very specific and picky question, but hopefully someone has some insight. Thanks!

-Tim

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.