[A6] Re: A6 Digest, Vol 122, Issue 3

[rexkarz at cox.net]

On my A6, I had to have a main board replaced to fix a lock-up. The tech also replaced 2 oscillator chips. This was from an authorized Alesis Repair shop in North Hollywood. I'm not sure what is wrong with Yours, but I know that these chips go bad!
Rex
> 
> From: a6-request at code404.com
> Date: 2005/10/09 Sun PM 03:00:07 EDT
> To: a6 at code404.com
> Subject: A6 Digest, Vol 122, Issue 3
> 
> Send A6 mailing list submissions to
> 	a6 at code404.com
> 
> To subscribe or unsubscribe via the World Wide Web, visit
> 	http://mailman.code404.com/mailman/listinfo/a6
> or, via email, send a message with subject or body 'help' to
> 	a6-request at code404.com
> 
> You can reach the person managing the list at
> 	a6-owner at code404.com
> 
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of A6 digest..."
> 
> 
> Today's Topics:
> 
>    1. Oscillator flaws (Siro Mateos)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 09 Oct 2005 20:18:11 +0200
> From: "Siro Mateos" <siro_mateos at hotmail.com>
> Subject: [A6] Oscillator flaws
> To: a6 at code404.com
> Message-ID: <BAY108-F71EE1A507B4FA7DB7DA3596860 at phx.gbl>
> Content-Type: text/plain; charset=iso-8859-1; format=flowed
> 
> 
> Hi all!
> 
> I've discovered what seems a hardware flaw in my A6 oscillators. I'd like to 
> hear what
> 
> you experience when reproducing this really crankie bug:
> 
> On the oscillator of your choice, set up both square and triangle outputs on 
> (saw and sine
> 
> off), pulse width above 80%, no PWM, and turn sub-oscillator mix to the 
> maximum. Now
> 
> start playing while you increase square output level from it's 50% default 
> level to the max.
> 
> Well, here it is... on my unit this setup causes a suddent pitch fall when i 
> reach the
> 
> maximum square output level, and this flaw is different in magnitude from 
> voice to voice.
> 
> It turns out that only 4 voices handle this situation flawesly, in fact only 
> one voice (no. 2)
> 
> stays perfectly in tune... out of 16 voices!!. When I set rotary assignement 
> of voices, my
> 
> A6 plays sort of an arpeggio when switching from voice to voice, and if I 
> try unison all
> 
> voices, then emerges a really beautiful and dense 'kind of major' chord from 
> only one
> 
> keyboard note. Finally, when I try the other oscillator, i find pretty the 
> same flaw
> 
> magnitude on the same voices!
> 
> I've been unable to find more combinations between waveforms outputs in 
> which the flaw
> 
> manifests. If I turn on sine, or saw, or narrow down pulse width then it 
> sweeps to normal
> 
> pitch.
> 
> Please, post some comments about this.
> 
> Thanks!
> 
> 
> 
> 
> ------------------------------
> 
> _______________________________________________
> A6 mailing list
> A6 at code404.com
> http://mailman.code404.com/mailman/listinfo/a6
> 
> 
> End of A6 Digest, Vol 122, Issue 3
> **********************************
>