From the MAKE Flickr pool
Solipsistnation posted detailed info for the excellent MeggySeq project (we recently covered) -
MeggySeq has 8 patterns of 16 steps each. You can set each of those steps to play one of 8 WAV files on the waveshield. You can play the pattern back, stop it playing, and change the tempo. You can copy patterns from one slot to another. You can even save all 8 patterns from RAM to EEPROM so they won’t be lost when you turn off the Meggy Jr.
You can loop patterns into longer compositions (up to 8 patterns long) and edit the patterns and pattern parameters (like tempo, loop length, and pattern length) without stopping playback.
You can edit one pattern while another is playing, and if you change patterns during playback, the first pattern will finish playing before jumping to the newly-selected pattern (or the next pattern in the loop if you’ve turned on looping).
As he goes on to mention, Meggy Jr. isn’t used for sound output in the project, but instead acts as a step sequencer triggering sample playback on a seperate Arduino + WaveShield unit. Over a serial cable, Meggy sends the numbers 1-8 corresponding to .wav filenames on the shield’s SD card. This could easily be used for a live gig – nicely bright and blinky for low-light venues. Get down with all relevant source code & instructions on Solipsism.net
In the Maker Shed: Arduino WaveShield Kit