Here is the pinout for a Tentacle to iPhone Cable. With this cable you can use Tentacle to record audio TC to your iPhone or use Apps like MovieSlate.
Please note that this cable differs from the included “iPhone Setup Cable” wich is a 4pin to 4pin cable.
Ambient en Denecke apps will do this.
To make an input cable you need to insert a can and resistor to tell the iphone there is an audio input.
Remember any smartphone has some latency and is not frame accurate. If you use it for rough syncing or for a script girl it’s fine, but it’s not a cheap TC slate for syncing.