Henry90 wrote:maybe a nice amplifier that enhances the high and brilliant frequences, something like that. Do you have anything in mind? ?
Having never needed to attempt something like this I'm afraid I can't give you any specific suggestions.
The issue you are going to have doing this is that you are imparting the sound of an amp/cab onto your acoustic guitar, which it was not designed to do. The only time I've heard a band do this with any great success was Wheatus, but they did it to become part of their sound, not because the acoustic sounded bad (some might say it sounded bad because of it
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You can switch the amp section off in AT, leaving you the mic'd cab and the room mics to play with so, in theory, if you can find a flat sounding cab you might be able to change the sound of the acoustic into something more usable, but it might take a lot of time.
Without hearing what the acoustic guitar sounds like, it's difficult to suggest how to fix it but here's somethings to consider:
1) It might not sound great by itself, but how does it sound in the mix with other instruments - this is more important.
2) Consider what doesn't sound amazing about the guitar? Is it the guitar itself or is it the recording? If it's the recording then change the mic you use, the position of it, the position of the player in the room or the room you record in. These will all have an effect on the recording. Take the time to experiment. For example, if you are recording in quite a dead room so the high frequencies come across as dull, place a sheet of hardboard shiny-side up on the floor underneath the guitar position - this will reflect the sound and bring some life back to it.
3) If it's the guitar and the recording you have made is the best you can get, then I maintain that using EQ, compression and (probably) reverb in your DAW will yield better results than anything in AT as it's an amp sim and not designed for anything else.
4) If you've tried all these things then I'm afraid it perhaps comes down to saving some money for a new acoustic guitar. But I think this will only need to be a last resort, there's plenty you can do to get a better recorded sound.
Hope that helps.