TX–6 - how do i use the internal effects?

TX–6 features built-in effects, FX I and FX II.

FX I are send effects and can be applied individually to any channel.
FX II are insert effects and can be applied to one or all channel.

more information here:

• https://teenage.engineering/guides/tx-6#fx-buttons

additional TX–6 resources:

• firmware update
• user guide
• explore