QSI's system was first. MTH licensed a slightly dumbed-down version (to control cost) of Q2+. Interestingly, if you listen to early HO BLI steam locomotives, you will hear those same QSI sounds. The whistle clip is very distinctive. Pre-TMCC, QSI dominated the electronic reverse unit/sound market. Their systems could be found in MTH, Weaver and 3rd Rail locomotives.
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