а там у комбарей кроме маршала есть return?

вроде у Катаны был

The BOSS Katana 50 MKII does not have a dedicated effects loop (Send/Return) as a standard feature. However, there are several workarounds and modifications that can be used to achieve similar functionality. Workarounds and Modifications: 1. Using the "Power Amp In" as a Return: The "Power Amp In" can be used as a return point for external effects, effectively bypassing the amp's pre-amp section.