It all has begun long time ago, when Chuck Steinman of DataQue created this set of plans for building stereo sound by installing a second Pokey chip inside the best 8-bit computer ever. Once installed, the second channel has all its addresses 16 bytes set higher in the memory ($D210 - $D21F). Since then, dozens of sounds and demos that support this upgrade have been published. Most of these programs were made in Poland, but a few sound-demos were also made in other countries. The most popular programs (in my opinion, of course) playing msx in stereo are Yooomp! and Numen.
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