What does the little key button do on the left of each timeline?
You can edit one visible layer at a time but you may well want to see what is on other layers when you do. Pressing the key button on a timeline causes that layer to be painted in the edit window but not edited. This is useful for lining up layer objects. What sound formats can I use In the basic Midp 1.0 player, none. It varies in the phone specific players with the most common way to play sound using the JSR135 Multi-media Java extension if the phone has it. The japanese phones support the SMAF (.mmf) format because they use the yamaha sound chip while the latest phones like the Nokia series 60 phones (excluding the 7650) support Midi type 0 files which produce fantastic sound (as does Siemens). The Nokia series 40 player supports the Nokia short messaging ringtone (.OTT) format. In general it is best to be careful using sampled sound file formats such as WAV because these are huge compared with their duration and can negatively impact download size.
