I was listening to this wonderful recording by Frank Reinicke, primarily to hear the Catherine Lamb piece which is also great, and stumbled onto this marvelous example of what the solo bass can do with extended harmonic technique. To my delight I also discovered that the sheet music has been made available by the composer --not that I can imagine having the technique to play this, but one can dream.
https://www.plainsound.org/pdfs/counterpoint.pdf
Here it is on YouTube (although it definitely should be heard in a better form):
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