asterisk users - Sep 2003 - app_festival volume problems

I'm using app_festival to speak some text to callers.  I'm having two
problems with this.  The first is with IAX calls (I've not tried others)
the first few seconds of the speech is garbled.  The second problem I'm
having is the the volume of the speech IS VERY LOUD.  I tried putting
the following in the siteinit.scm but it didn't seem to make any
difference.

(set! default_after_synth_hooks
      (list
        (lambda (utt)
          (utt.wave.rescale utt .5 t))))

Does anyone have any suggestions?
-- 
Sample configs and more: http://www.fnords.org/~eric/asterisk/

BTEL Consulting
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I am running CVS-09/11/03-14:03 on Redhat 9.0

Trying to get call waiting / call waiting callerid working.
The setup is:
X100P asterisk -> MGCP --> analog phone.

What changes to I need to make to my mgcp.conf and extensions.conf file to
allow answering of Call waiting calls?  And how do you answer call waiting
calls with the system.

I have usecallerid=yes, hidecallerid=no, callwaiting=yes,
callwaitingcallerid=yes, threewaycalling=yes, transfer=yes,
cancallforward=yes, callreturn=yes, echocalcel=yes and
echocancelwhenbridged=yes in the zapta.conf file.

How do you use these features?  Or where can I find some documentation.

I found some information about *0 on the thread but I couldn't find the
corresponding config information.  Also, is thier a list of functions like
*0 and how to use them.

Also, on another note.  Using this setup to make normal calls I am getting
significant echo for the first 15-20 seconds of a call and then it goes
away.  I assume this is the echo canceller but is their any way to fix this.

Thanks for your help.
Chad Graham