[maxmsp] [bugreport] artefacts with a 4 tracks groove~ when interp on

The included patch says it all :

Playing a 4 tracks buffer with [groove~] at a non-normal speed (i.e.  
not 1. nor 0.5) creates artefacts on the 4th output of [groove~] when  
loopinterp is turned on.
This happens with or without rounded corners or blurry fonts, on  
MacBook Pro under X.5.2, on G5 under X.4.11.

#P window setfont "Sans Serif" 9.;
#P window linecount 2;
#P comment 399 131 100 196617 5_ turn interpolation at loop points off;
#P window linecount 1;
#P comment 258 183 100 196617 4_ change speed;
#P newex 48 198 60 196617 loadmess 1;
#P flonum 207 180 47 9 0 0 0 3 0 0 0 221 221 221 222 222 222 0 0 0;
#P hidden newex 240 428 45 196617 pcontrol;
#P toggle 404 157 15 0;
#P message 404 176 68 196617 loopinterp \$1;
#P message 100 323 27 196617 stop;
#P message 31 323 65 196617 startwindow;
#P message 172 142 24 196617 0.5;
#P toggle 48 221 15 0;
#P message 48 246 41 196617 loop \$1;
#P newex 154 356 119 196617 dac~ 1 2;
#P toggle 154 96 15 0;
#P newex 154 162 27 196617 sig~;
#P newex 154 287 84 196617 groove~ hitme 4;
#B color 5;
#P message 21 65 43 196617 replace;
#P newex 21 88 95 196617 buffer~ hitme 2000;
#B color 15;
#P window linecount 2;
#P comment 77 59 126 196617 1_ open a 4 tracks sample file;
#P window linecount 1;
#P comment 71 222 75 196617 • loop on/off;
#P window linecount 2;
#P comment 172 95 103 196617 2_ play normal speed forward/stop;
#P window linecount 1;
#P comment 198 143 38 196617 • slow;
#P comment 164 307 62 196617 audio output;
#P comment 31 309 69 196617 • start audio;
#P window linecount 2;
#P comment 399 103 100 196617 3_ turn interpolation at loop points on;
#P user panel 18 303 123 43;
#X brgb 255 255 255;
#X frgb 100 202 30;
#X border 2;
#X rounded 0;
#X shadow 0;
#X done;
#P connect 9 0 8 0;
#P connect 23 0 15 0;
#P connect 15 0 14 0;
#P connect 22 0 11 0;
#P connect 16 0 11 0;
#P connect 12 0 11 0;
#P hidden connect 19 0 10 0;
#P connect 11 0 10 0;
#P hidden connect 14 0 10 0;
#P fasten 18 0 13 0 105 351 159 351;
#P fasten 17 0 13 0 36 351 159 351;
#P connect 10 0 13 0;
#P fasten 10 3 13 1 213 330 268 330;
#P connect 20 0 19 0;
#P window clipboard copycount 26;


_____________________________
Patrick Delges

Centre de Recherches et de Formation Musicales de Wallonie asbl
http://www.crfmw.be/max