This is the one, if you want midi control to SP 404 with Loopy Pro. You can also record your effected beats or song parts to separate audio clips and bring them to song page.

Control bus1 and bus2 efx with dedicates controls.

Trigger patterns from pattern page with touch of iPad

Access all the pads in banks

Create midi scenes and automation clips.

Version is 0.5 because bus 2 controls are not recorded to automation