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Here is 12 minutes of LaCucaracha I recorded today. That's about as long as my YBB-104 can go before water starts bubbling in the main tuning slide. I believe the arrangement used is for C instruments, so this is a whole step flat. My lips were good today, so this is the best I can play at this point. Two filters are applied. One is a gentle (single pole) lowpass that partially compensates for the lack of bass response from my mic. The other is a so called 'brick wall' lowpass filter that removes anything above 2800 Hz. This one hides the buzzing tone I am working to improve. When I listen to it, the biggest problem I notice is the imprecise control over the length of notes.