wave sample piano with 4 velocity layers (but without the release samples)
I've had an axoloti for a few days now and I think it's great. Actually I only wanted to test it for Midi Din to USB and back. But I think the patches and their possibilities are great.
I also like the independence from the PC. For a long time I'm looking for a piece of hardware to play my own sound files (SF2) without a PC. I don't seem to be the only one looking for something like this. Now that I wanted to know how powerful the Axoloti is, I searched for samples for a piano under this link:
The City Piano is a fully sampled Baldwin Baby Grand with 4 velocity layers and release samples. It is free and public domain. Do anything you like with it.
Now I've run into some trouble. First of all, I converted the samples from stereo to mono and at the right rate. In stereo, I use too much resources on the Axoloti. Here I used the software sox.
I used sox with the following parameters: -t raw -e signed-integer -b 16 -c 1 -r 48000
The notes were then renamed. Note and velocity response. Example Grade: 21
Quiet: 21 = 021
Average: 21 + 127 = 148
Strong: 21 + 127 + 127 + 127 = 275
Loud: 21 + 127 + 127 + 127 +127 = 402
These 4 files result in the 4 velocity layers for the Midi-Note 21.
Then I have to evaluate the velocity dynamics to play back the correct file.
See my patch: homaMidiKeyV1.axp (12.3 KB)
The samples (in the required format) are available here: https://1drv.ms/u/s!Am2OR1KBwBangbkIFsnSAlsd2n6Mog
Currently, the patch can play up to 14 notes. That's enough for Elise, but other pieces are getting cramped. Especially if Sustain is used. Then errors occur.
Here is also my question if it is possible to discard the first (oldest) notes and play back the current (new) ones when reaching the limit of 14 under "poly"?
How would that be possible?
Another problem is cracking with very fast playing. I already use a fast SD card here.
SD-Card SanDisk Ultra with the specification: A1 Minimum random read 1500 IOPS
I also recommend the virtual keyboard for testing, as it changes the velocity/volume with the mouse depending on the click position: http://www.tobias-erichsen.de/software/virtualkeys.html
Or play some piano midi files with a midiplayer like http://falcosoft.hu/softwares.html
To try creating directory on sdcard: /homaMidiKeyV1
and copy all 353 files noteXXX.raw from noteXXX.7z to your SD-Card!