Measurement of the resonance curve (Acoustics)

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Hi,
I have added the following before the block shown by Jens and it works:

<!-- 2023 -->
<count>
            <input as="buffer" clear="false">fft2500</input>
            <output as="count">count</output>
</count>
        <if less="true" equal="true" greater="false">
            <input as="a" clear="false">count</input>
            <input as="b" type="value">0</input>
            <input as="true" type="value">0</input>
            <input as="false" clear="false">run</input>
            <output as="result">run</output>
        </if>
So run remains zero until appearance of fft2500...

Example is a tube of 23 cm length with open ends.

Best
Mikhail