USB Midi delay

[grillem]

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Hi,

I am experiencing an issue related to #46 and #40. When using the library and sending midi messages through USB, after around 40 seconds the function starts to have a delay of around 250ms. This issue happens whith an arduino Leonardo while the USB is connetced to a Windows machine, otherwise on Mac or with other architectures (SAMD21) it works as expected.

Is there any way to resolve this issue?

Thanks, Guillem