Congratulations on your new purchase!
There is a self calibration and voice test mode in the Matrix1000. This
is explained on page 39 in the manual. Select Ext. Funct. #7 and press
enter. Test 0 will run the auto calibration routine. The display will
show CAL and it takes a few seconds to run. This will calibrate the
oscillators, filters, and VCA's. Test 1 will show the voice that is
triggered. If you have a bad CEM3396 voice chip you will hear the
difference. One of mine had bit of noise for the attack portion of the
envelope when all the other 5 voices sounded fine. Then you can replace
the bad chip. I bought several from: www.maad.net/ms6/index.html
They were $18 US each or 6 for $90.00.

Let us know what you find, Fran

--- In oberheim@yahoogroups.com , "resistenzaaoltranza"
<resistenzaaoltranza@...> wrote:

>
> Hello, there! I am a new proud Matrix1000 owner. Testing all the
> voices I felt something was wrong: pressing the same note six times, I
> hear the last behaving strange, sounding less full, flat...This
> happens each six notes played. Maybe one of the Cems has gone Battery
> low Even resonance sounds too "raw" and irregular to my ears...Any
> help or suggestion is highly appreciated, thanks!
>