GrumpiusMaximus
I've Seen Things You People Wouldn't Believe
Bass is particularly challenging for audio-MIDI conversion! Playing an octave up (as others have said) is definitely a good idea. With bass, the fundamental is often quite weak and harmonics get mistaken for the fundamental by automatic detection software.
Auto-tune software (like Melodyne, which has been mentioned in this thread) works by tracking the notes of the singer and then working out how off-note they are (and correcting it). Melodyne with a .mid export would be the best thing to use because the software was essentially designed to detect note inputs. A lot of modern DAW software has some kind of built-in auto-tune software but I'm not sure about the MIDI output capabilities of them.
In terms of software to write the notes down, there are plenty of free score editors out there. Finale and Sibelius are the 'standard' but they are expensive. MuseScore is a capable free score editor but it is a little different - but should be able to take a MIDI file as input and transcribe automatically. Always check the transcription after it's been converted...!
On a side-note, auto-tune software was first developed by seismologists looking to analyse earthquake waves. Then they realised there was a much bigger market for music!
Auto-tune software (like Melodyne, which has been mentioned in this thread) works by tracking the notes of the singer and then working out how off-note they are (and correcting it). Melodyne with a .mid export would be the best thing to use because the software was essentially designed to detect note inputs. A lot of modern DAW software has some kind of built-in auto-tune software but I'm not sure about the MIDI output capabilities of them.
In terms of software to write the notes down, there are plenty of free score editors out there. Finale and Sibelius are the 'standard' but they are expensive. MuseScore is a capable free score editor but it is a little different - but should be able to take a MIDI file as input and transcribe automatically. Always check the transcription after it's been converted...!
On a side-note, auto-tune software was first developed by seismologists looking to analyse earthquake waves. Then they realised there was a much bigger market for music!