What I do here on the node in my home (27935 for now), using an Icom 706 is...... <br>
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Set the &quot;data&quot;  port to 9600. So I&#39;m getting essentially discriminator out.  And no pre-emphasis being done by the transmitter. <br>
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Use the &quot;flat&quot;  audio from the radio and let the DSP do the de-emphasis and PL decode. <br>
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And also I let the DSP again handle pre-emphasis and PL  encode. <br>
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If you have COR and/or PL decode logic outputs.  You could still use the DSP for audio conditioning.  <br>
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Please excuse my brevity and typing errors.