There is a song I know from childhood, and I'm in the process of transcribing it from memory. I can write down the pitches (I use [numbered notation](https://music.stackexchange.com/a/110915/70803)), and I can transcribe the rhythms except when the notes become too fast for me.

I was able to transcribe both the pitches and rhythm of a traditional local song, "Potong bebek angsa", that uses only relatively slower notes, but the one I'm working on now has parts that are too fast.

**What means can I use to transcribe these faster portions, or how can I train myself to be able to do it?**

Again, I can get the pitches, but how do I determine their rhythmic values?