Can anyone confirm ? b = Buffer.readChannel(s, "sounds/a11wlk01.wav", channels: [0]); b.plot; //ok b = Buffer.readChannel(s, "sounds/SinedPink.aiff", channels: [0,0]); b.plot; //ok b = Buffer.readChannel(s, "sounds/a11wlk01.wav", channels: [0,0]); b.plot; //not ok Please post the actual fix, beacuse I am working with a build I cannot rebuild, unless Jan commits the .speak fix ! thanx Zlatko