====== Audio signal considerations. ======

Some PC’s has a line input direct and other only has a headset input where you need use a speaker – microphone splitter to access the line input.\\
Note also that microphone input may have a 5V DC which means that your line signal to the PC must be AC coupled.\\
(I have not been able to find a inline box which makes a DC isolation, DC filtering but they are available)\\
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We want to have a good beat signal and this can be difficult to achieve.\\
If you have drum signals then you can mix an output with a clear drum signals for the S2L only.\\
Another idea could be using a keyboard aux output setting up a click signal which gives the beat.\\ 
This is normally also used by drummers to get time sync with the band.\\
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Also if it is possible then it may be an idea to make some low pass filtering on the signal.\\
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