抱歉，我錯過您這篇，不知道你試過Logic Remote app了沒?
我剛查了一下，目前已經有支援Logic Loops的介面了。
Logic Remote
Logic Remote is a companion app for Logic Pro and GarageBand on the Mac. It provides an innovative way to extend the creative power of Logic or GarageBand by using your iPad or iPhone. Designed to take full advantage of Multi-Touch, Logic Remote offers new ways to record, mix, and even perform...
apps.apple.com
我知道有logic remote抱歉，我錯過您這篇，不知道你試過Logic Remote app了沒?
我剛查了一下，目前已經有支援Logic Loops的介面了。
Logic Remote
Logic Remote is a companion app for Logic Pro and GarageBand on the Mac. It provides an innovative way to extend the creative power of Logic or GarageBand by using your iPad or iPhone. Designed to take full advantage of Multi-Touch, Logic Remote offers new ways to record, mix, and even perform...apps.apple.com
不過我自己試的時候似乎沒辦法像影片一樣
邊錄邊播loop
找不到Logic pro裡面Cell的設定該怎麼調整
我目前沒有ipad可以幫你測試，但影片中，左邊上下方向鍵是切換音軌，中間其實就是MIDI Keyboard，右邊Lunch Pad是用來驅動Loop及錄音。
那這樣，我剛找了另外一部影片是Ipad remote應該是可以類似你貼的影片中那樣邊播放邊錄音。不過我目前無法幫你測試，我自己也無法確定。但理論上應該是可以的。
請參考看看7分半左右(雖然我找到的影片示範的有點糟糕)。