Hi Zoe,
The feedback audio can only be turned on and off as mentioned in the documentation (https://help.findingfive.com/api/responses.html#choice). The loudness is intentional - participants are much more likely to turn down their speakers / headphones than turning them up. So, it's better to start from a relatively loud point from a design perspective.
The style of the visual feedback unfortunately cannot be changed.
The feedback audio can only be turned on and off as mentioned in the documentation (https://help.findingfive.com/api/responses.html#choice). The loudness is intentional - participants are much more likely to turn down their speakers / headphones than turning them up. So, it's better to start from a relatively loud point from a design perspective.
The style of the visual feedback unfortunately cannot be changed.