Well, in regards to the technical issue, there's not much possible to do here, except to upgrade to 3.6.0 when you'll have a chance. In theory we maybe will be able to increase channels little more, because the new audio system in 3.6.0 may allow that, but I'd have to make a proper test first.
And, it's best to have some prototype scene to see how it works when there's that many cartoons with sounds playing at once; whether it's essential to have them all playing together, or limiting simultaneous plays may be an option, etc.
And, it's best to have some prototype scene to see how it works when there's that many cartoons with sounds playing at once; whether it's essential to have them all playing together, or limiting simultaneous plays may be an option, etc.