I tried the same thing with butterlp opcode last week and it appeared to have the same problem. --Jonathan >>> 02/09 12:28 AM >>> Message written at 8 Feb 1999 21:52:02 +0000 --- Copy of mail to jdrexler@support.ucla.edu --- Are you really asking that tonex have a 'skip initialisation' option? I implemented that for biquad the other night. Any others we have missed? ==John ffitch !