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• Huby - 2ch+d.
• Phaser 1 - 2ch+d/dd. Канал 1 может настраиваться. Канал 2 может быть одним из предопределённых инструментов. Барабаны могут быть либо цифровыми, либо синтезированы.
• Savage - 2ch+d. Движок с множеством эффектов. Поддерживает арпеджио.
• Special FX - 2ch+d. Оба канала поддерживают "coily"-зондирование и эффект задержки. Канал 2 чуть громче канала 1.
• Beep Tracker - 5ch+dd. Регулировка громкости, много эффектов, до восьми семплов барабанов и ужасная расстройка вне октавы 3.
• Electric Duo - 2ch. A new beeper engine by krue, currently has experimental support in 1tracker. To be more specific, it's not for ZX Spectrum 1-bit music, but for Apple II (which is quite an idea for a wildchip compo).
• Phaser2 - 2ch+d. A follow-up to Phaser1, except with more customization and no digital drums at all. On the other hand, you can define how will synthed drums sound like, all by yourself, too!
• POWW - 2ch+d. It's possible to change the waveform on ch1. Adjusting speed in it might be tricky, considering that the speed also depends on what settings are set in the first channel. The drum channel can do only two samples.
• Octode - 8ch+d. The most record amount of channels held on a beeper so far. Features eight drum samples.
• Stocker - 2ch+d. Special FX with cream and cherry on the top: now it features more adequate volume control, slides and arpeggios! The only downside is that you need to get along with Vortex Tracker II first.
• Tritone - 3ch+d. Features sounding a-la Savage, but is in fact MORE flexible than that, allowing for 8 different pulse wave widths and a dozen of drum samples.
• QChan - 4ch+d. Say, it's basically Special FX on four channels! Limitations to note: global volume support only, only one note length per channel on one pattern.
• ZX-10 - 4ch. Each channel may have its' own level of decay.
• Earth Shaker and Lyndon Sharp's 2ch - 2ch+d. Both have only two drum samples to back it up with.
• Plip Plop - 1ch+d. Something you'd easily call a one-channel version of Earth Shaker engine. Except this one has pitch bending feature!
• Tim Follin's 3ch - 3ch. Used by the man himself for his early beeper works, such as Vectron.
• ZX-7 - 8ch. The only eight-channel music routine before the introduction of Octode. Which is slightly better, because it has drum samples. It's still a classic, though.
• tBeepr - 2ch+d. In a nutshell, it's basically Music Synth 48K with drums. Recovered and cleaned up by introspec from his old 1995 game, Tank Battle. Examples from the same game can be found here. The engine restoration is still a work in progress.
• ntropic - 2ch+d+d. A beeper engine by irrlicht project. Able to produce fixed-frequency white noise. Another cool quirk of it is that it's able to produce border effects in sync with the song.