Steve
Do you have Decoder Pro (JMRI)? If so, that is really all you need. CV 252 implements the delay (a value of 45 equates to the 3 second delay)
This is the "Advanced" tab for the LokPilot Micro in DecoderPro. Note the setting in the lower right for Startup Delay.
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This is the "Function Map" tab for the decoder. See the lines for F8. That is the flag that needs setting to enable the delay (Virtual Drive Sound)
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What you want to do is open up JMRI, do a "read all sheets" on the decoder first (DO NOT ASSUME THE DEFAULT SETTINGS ARE WHAT IS IN YOUR DECODER). Then, check the entries I have shown.
If you also have Full Throttle implemented in the LokSound, add the Drive Hold and Dynamic Brake logical functions to the same function buttons as in your LokSound, as well.