This instrument might be a challenging one for many players due to its extremely high backpressure. Although yiḏaki with high pressure is not popular amongst the (non-Indigenous) players, I often recommend these instruments to challenge skills and muscles. It also helps you to understand the dynamics of the didgeridoo in general. So if you do not have one, here is one for you from a master maker on a good price!
Listen to this yiḏaki here: