It is important to be clear: is a subscription-based professional application, and there are currently no legitimate "cracked" or "patched" IPA files that allow you to bypass Apple’s security and subscription verification safely. [1, 3]
I can, however, help with legal alternatives and useful information:
You're looking for information on Logic Pro for iPad, specifically regarding a cracked IPA version for iOS, and how to download it for free with a patched version.