In Version 9 

FindProcessParameters[x, FractionalBrownianMotionProcess[h]]


returns {h -&gt; -0.0257885} without an error message. 

However, since h should be non-negative, this is an invalid result. In fact

ProcessParameterQ[FractionalBrownianMotionProcess[-0.0257885]]


gives the error message with and returns False:


  


In Version 10, rather than returning an invalid estimate FindProcessParameters returns with the "invalid process" message.

FindProcessParameters for Fractional Brownian Motion Returns Error
What are the musical instruments that have the sounding range that has at least all notes on this range A#1-C5?
The instrument can go up to C6, or down to c0, it just need to have all the notes on A#1-C5 (including C5 and A#1).

Most pdfs I can find on internet with it a pretty basic, and dont have enought instruments. On Wolfram alpha website, its possible to find the range of instruments, many different ones, but you actually need to write down the instruments you know to check their range 
