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MMD > Archives > November 2020 > 2020.11.27 > 03Prev  Next

Pianola Repeats Chained Note Perforations
By Bernt Damm

Firstly, there are some rolls out there where the perforations are just
too small; they do not play properly with problems as you describe.

Secondly, you need to test your valves effective bleed size. For this,
put the roll drive in neutral. Use a roll, preferably a test roll and
turn it by hand, uncovering the tracker holes slowly. Observe where the
note plays.

If you need to uncover more than 1/3 of the hole before the note plays,
your effective bleed is too much [or] leaking pouches or bleed cups too

If you need to uncover less than 1/8 of the hole, your bleed is too
little [or] blocked bleeds or some mistake during assembly.

Let us know the result, please.

Bernt Damm

(Message sent Fri 27 Nov 2020, 06:44:53 GMT, from time zone GMT+1100.)

Key Words in Subject:  Chained, Note, Perforations, Pianola, Repeats

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