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1. Add something to an already existing indicator. Say I want to add a sound alert when RSI cross 30?
You cannot edit existing mq4 indicators. The indicator builder can use existing indicators so in a TI you can create a calculation that uses a signal of an existing indicator - just import it. Usually you need at least 2 signals so you need a TI per signal.
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2. If this can't be done, is it possible to add a sound alert to any custom indicator that created by Indicator Builder?
If you use the advanced options you can add the code but this requires some mql knowledge.
If your alarm in the strategy builder does not work, post your strategy file .mol in the forum to take a look