ASCII Chars problem [1]

Hello everybody, maybe this is a very silly question, but I cannot manage how to map correctly some ASCII characters on Xshell.
For example, I would like to obtain a:
~ with ALT+126
` with ALT+96

However, I cannot make it work.
Do you have any suggestion/help?
Thank you very much in advance



Program Ver. : Xshell 4

Thank you for posting the question. Alt codes are not supported in keymap yet. We will consider adding it in the future.

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