ansible earthsea is a polyphonic version of the original earthsea when it comes to creating sequences. however it doesn’t support shapes, which are 3 CVs that can be set with shape gestures (i should probably clarify i have no intent to add them to ansible earthsea port - sorry @PacificNorthWes!)
CV shapes can be slewed, so they can be used for modulation similarly to envelopes/LFOs, which is probably why it’s tagged that way in modulargrid.
please note that MIDI function is not related to earthsea app, it’s an addon on the original earthsea module, and a separate mode on ansible.
power wise i imagine both earthsea and ansible being able to power whatever is connected to the USB port, it’s part of USB spec. you must keep in mind both were rated for grids specifically, so it’s possible some MIDI devices exceeding the maximum allowed amount could potentially spell trouble if they draw too much power.
another thing to keep in mind is that ansible has its own +5V regulator so it will draw less power on that bus. if you plan on using earthsea make sure you have sufficient power in your rack! (well, ansible too, but this is much more critical for earthsea).