This is one of the reasons that I actually take notes in three different media: paper notebooks, an old-school digital voice recorder, and in text files. Different media have different advantages and disadvantages and represent different ideas for more readily.
I have used the voice recorder less over the years but I find it optimal when time is limited and I have to move onto something else. Part of using a voice recorder as a medium is listening closely afterwards and writing down what I said in a different manner (either in a more permanent paper notebook or digitally in a text file). And yes, each iteration transforms the idea at least somewhat. It gives you the chance to see the idea in a different way.
Paper Notebooks + old-school Digital Voice Recorder (get one which takes replaceable batteries) are a great combo to train oneself to use regularly and consistently for everything.
I use an old Olympus WS-700M, though I did buy a different voice recorder recently and haven't used it much yet. The WS-700M works fine for its designed purpose. You can start recording basically instantly and the replaceable and rechargeable battery lasts forever. I think almost any voice recorder nowadays would work fine. You can use your phone if that works for you. It's a mature field. I just record things and delete them in a day or two. The WS-700M does also make a good MP3 player if you want something disconnected from the Internet.
I have used the voice recorder less over the years but I find it optimal when time is limited and I have to move onto something else. Part of using a voice recorder as a medium is listening closely afterwards and writing down what I said in a different manner (either in a more permanent paper notebook or digitally in a text file). And yes, each iteration transforms the idea at least somewhat. It gives you the chance to see the idea in a different way.