My master thesis “The development and analysis of a Microtone-Duplex trumpet – An experiment towards extending the tonal and timbre possibilities of the trumpet” is available for free download.

In the document you can find:
a. brief history of different experiments with brass instruments in the past centuries
b. presentation of the Microtone-Duplex
c. intonation analysis
d. description of the constructing process
e. tables of measurements with frequency analysis.

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