Firefox Audio Data builds on a fast system sound the best, irrespective of JSMESS version or Emscripten version 1.7.8+. Everything else doesn't sound as good.
Emscripten build 1.7.1 has raw, unbuffered audio. 1.7.8 has better-tuned audio. 1.10.0 was "incoming" around Feb 1. e6d16cdb1a is "incoming" around Feb 5, after Web Audio-specific patches to emscripten.
| JSMESS version | Emscripten version | FF Audio Data link | FF/Chrome Web Audio link |
| 0.151 | 1.10.0 e6d16cdb1a | (no Audio Data differences) | Web Audio A800-151-e6d16cdb1a |
| 0.151 | 1.10.0 | Audio Data A800-151 | Web Audio A800-151 |
| 0.151 | 1.7.8 | Audio Data A800-151-178 | Web Audio A800-151-178 |
| 0.142 | 1.7.8 | Audio Data A800-142-178 | Web Audio A800-142-178 |
| 0.142 | 1.7.1 | Audio Data A800-142-171 | Web Audio A800-142-171 |