Irig stomp with drums

[Meridork]

I connected my roland td4k module to my iPhone using irig stomp

I can recorded a video with direct sound
it's working good with drums and background music

The issue is headphones.
Where is the best option to connect
1. Connecting to irig headphones socket. No sound
2. Connecting between irig and drums module reduce the sound volume
Thanks
Kobi

[J0e3gan]

Does your drum module only have an unbalanced headphone stereo out? If so, have you considered trying a small headphone amp between your drum module and the iRig?

Seems strange that you don't get sound out of the headphone jack on the iRig itself, though. Hopefully someone else can comment helpfully on that.