Ganter G7a

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Hi,

I happened to come into possession of a Ganter G7a (left-handed) and wanted to hear what you think of it, or if you can give me an idea of ​​what I'm holding for a trumpet in my hand. Unfortunately I am not able to play them right now.

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
http://www.trompetenforum.de/TF/viewt...
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Thank you.