off the top of my pointed head: to the below, i'd say the pcm42 adds: 1) the delay time is selectively & progressively modulatable via internal LFO (as either a sine or square wave) and/or -(that's the progressive bit)- input amplitude. 2) a 'higher-quality' audio path than the eh16sd (though still w/ 8-bit pcm encoding at limited sample-rates), incl. a very subjectively 'nice' soft-clip limiter at the input. 3) mix output, delay time, feedback available via backpanel voltage controls. 4) a 'clock' output, w/some user-selectable subdivisors. 5) various mods were (are?) available, ncluding increased memory, memory reverse, 'new' loop points, etc..... 6) various outputs. best, dt / splattercell >The EH-16 has a function which modulates the playback rate. A loop would > >accelerate then slow down. In its extreme setting this was a wild effect. > >You could control the depth and frequency of this modulation. Yay analog! > >I miss it, but not the (unwanted) weird behavior it increasingly started >to > >exhibit when I ditched it 6 years ago as a collectable after 13 years of > >service. I think you'd be crazy to buy one now if you wanted a dependable > >and serviceable device.