No, only Input 1 and Input 2 are compatible with the signal chain in the Spark app to deliver built-in effects.
On Channel 1, the Spark app can fully control and save the guitar signal chain.
On Channel 2, the Spark app can manage certain aspects of the signal chain. Additionally, you have the option to incorporate extra preamps and effect pedals specifically designed for acoustic guitar, bass, and microphone.
*The preamps and effect pedals designed for acoustic guitar, bass, and microphone on Channel 2 cannot be applied to Channel 1.
Channel 3 and 4 do not support built-in effects from the Spark app.