Creating a specific sampler patch! Help!

Hello everyone!

I’m brand new here and am looking to create a patch for my organelle that can play back samples at a length of about a minute long. I’d like to be able to assign samples to all keys on the board and use the knobs to control speed and a reverb if possible! Also would like to use the aux button to record said samples onto the selected keys.

Does something like this already exist? I have tried it with a few other sampler patches but have been limited with them cutting out too early, only being able to play one patch transposed up and down the keyboard or only being able to play small pieces of the sample I want to record into the keys.

Thank you so much for all the help.