Emu XL-7 & MP-7 User's Group

The 128 limit is a hardware one.  The XL-7 has sound generation ASICs
and filter ASICs and an FX ASIC.  There are 128 pitch shift units (64
in each of the 2 chips), 128 6-pole filter units (32 in each of the 4
chips), and two effects processors in the FX chip.  Stereo voices use
two channels of generation and filtering.  12th order filters work by
chaining two filter sections, so each of those use twice the polyphony
(2 for mono, 4 for stereo).  Each instrument is a mono or stereo voice
(mostly mono), and a preset can have up to 12 instruments at a time.

As far as the original question, no, there's no screen to view
polyphony.  There is in the E4, but not the P2k/XL-7 series.  If I
remember right, there's a sysex command to enable output of a cc that
would follow channel count, but I don't know if that was in release
code or just debugging stuff.  I'll dig around...

-Aaron

--- "Bob S." <tttsystems@...> wrote:

> Thanks Steve for replying.  It made me also remember the filter
> order....jut when I increased the filter order of one of the voices
> last night....I need to verify I didn't loose any nearby notes.  
> 
> BTW, the 128 number I gave was the max. simple/advertised polyphony
> of the XX-7 (not the bpm I am using)..... 
> 
> I will re-review the old discussions to see how I can save some
> voices.....
> 
> Bob
> Corona/Riverside, CA
>   ----- Original Message ----- 
>   From: steve_the_composer 
>   To: xl7@yahoogroups.com 
>   Sent: Friday, March 10, 2006 1:24 AM
>   Subject: [xl7] Re: Maybe a retorical question on polyphony
> utilization
> 
> 
>   I've never seen such a feature. I imagine the overhead to track and
> 
>   display # of voices in use in realtime would cut into the box's 
>   performance. 
> 
>   I assume you know ways to cut down on the number of voices being
> used 
>   (get rid of unneeded chorus, get rid of 12-pole filters, make use 
>   unused layers have 000:none as instruments, etc.). Others
> interested in 
>   this might search the archives for "MOP"--Maxed Out Polyphony. (I
> seem 
>   to remember some discussions.)
> 
>   BTW, I am wondering if the 128 BPM limit is a hardware or software
> [OS] 
>   issue. Anyone know? 
> 
>   --- In xl7@yahoogroups.com, "bob_at_work_2000" <tttsystems@...>
> wrote:
>   >
>   > I know we can calculate the number of polyphony voices used by
> the
>   > XX-X units but as I build up a complex piece with dynamically
> active
>   > notes and long decay time, I am beginning to notice some note
> cut-offs
>   > probably due to maxing the 128 (hard to see how when you first
> look at
>   > it but I'm sure it adds up fast).
>   > 
>   > Wish there was/does anyone know of a way to look at maybe some
> screen
>   > or indication on the XX-X to see how close you are to maxing the
>   > polyphony?
>   > 
>   > Bob
>   > Corona/Riverside, CA
>   >
> 
> 
> 
> 
> 
> 
> 
>    
>   Yahoo! Groups Links
> 
> 
> 
>    
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 


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