Tinus, Sources to learn what you ask: http://ptg.org/resources-education.php A local Piano Technicians Guild chapter: http://ptg.org/aboutUs-chaptersAndRegions.php Keith On Jan 28, 2011, at 4:54 AM, seles tinus wrote: > … i have these tool , but how i can hear the beat (eg 7bps, or 9 bps)? …
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