Hi there.
MG3 can tackle almost anything I throw at it, but it gets stumped with a particular 7b9 voicing when played bossa nova (that is bass note first, then subsequently the other harmony notes).
See the following example of the A7b9 chord in question.
x
x
3
4
5
x
5
This results in the bass note playing a G, instead of an A.
Can anyone else replicate this error, and if so, is this a bug @JamO?
Cheers
Peter
for the record, that’s an A11
also: do you have an extra high sting? 7 strings I count there.
That’s why I didn’t reply, because I don’t use a 7-string guitar. 
Has have been previously discussed MG3 keeps having problems discerning some complex altered chords and dissonant intervals, that seems to be one of the most difficult problems to solve.
I have the feeling that people who plays music with more frequent complex altered chords is more sensitive to this problem than other who play music with less dissonances.
In the other side its an amazing piece of software capable of many wonderful things for the guitar players and after many years using MG2, MG3 bring some new and fascinating things to the game.
Haha, well I guess I have to be more thorough!
There was an x too many - I only have 6 strings:
And yes, it is a A11 chord - not a A7b9 chord as I stated, so I’ll try again:
x
3
4
5
x
5
The reason for the mixup is that the A7b9 (which typically comes after an A11 chord also results in erroneous tracking - though here the bass note [A] goes up a semi tone [A#] instead of down a whole tone:
A7b9:
x
2
3
5
x
5
I guess you are right, in that it is simply a more technical complex issue.
That said, the example I gave is not particularly a dissonant voicing per say.