@ustk @d-healey Ok it's working, thanks for your help !
Solved with this code :

//Combo box
const var cmbSampleMap = Content.getComponent("cmbSampleMap");
cmbSampleMap.set("items", sampleMaps.join("\n"));


inline function oncmbSampleMapControl(component, value)
{
	Sampler1.asSampler().loadSampleMap(sampleMaps[value-1]);
	for (i = 0; i < 127; i++)

 if (Sampler1.asSampler().isNoteNumberMapped(i))
    Engine.setKeyColour(i, Colours.withAlpha(Colours.blue, 0.3));
    else
   Engine.setKeyColour(i, Colours.withAlpha(Colours.white, 0.0));

};

Feature Request : A Drum Step Sequencer like arpeggiator module with associate sliderpack component :

Basic things :

Pattern length
Time grid (1/16, 1/32 etc.)
Magnetism on grid or free
12 or 16 tracks / sample slot
MIDI rec input from the keyboard or the drum pad
Syncronized BPM with Daw or free

For more, Hise's user can customize it :

Colors, background
Volume, pan, pitch on each sample slot
Drag user sample
Repeated note
Drum machine groove
send CV / Gate
FX send
and I must forget ...

https://forum.hise.audio/topic/3511/drums-sequencer-in-hise/8?_=1623432809025

@Christoph-Hart A configurable step sequencer would be a good feature to add in the future update of Hise like the floating tile keyboard.

I thought I had 128 frames but the export started at frame 0 so 'ive 129 frames. Noob error, problem solved. Thanks

@d-healey Great thanks ! It's compiles AU/VST now.
I'm on macOS Mojave 10.14.6, I've downgraded Xcode from 11.3.1 to 10,1, upgraded Projucer to 6.0.5 and use Hise - Scriptnode version.
(I detail my configuration it can help someone else)

Ok, thanks for the answers

Hise is a great tool to make music plugins/app, I also use Maize sampler it's simpler but limited, in Hise with a bit of coding you can do something more advanced + effect plugins and standalone app which is not possible with Maize.
However, I find having to compile my Hise application and my plugins on multiple OS's a bit annoying although I understand that for some having all these options is important.

How about a simple Hise standalone application installer for MacOS, Windows, Linux without the need to compile your own and similarly to Maize Sampler a cloud server system to compile plugins in all formats (AU, VST, AAX for Mac PC, Linux)
I think it would get more people (Software dev noob like me) to use Hise.

Thanks for reading, waiting for your advice

@Christoph-Hart @d-healey

@Christoph-Hart @d-healey What you think about ELK Audio OS to embed Hise linux plugin on the latest Pi 4 ?

@AudioHobbyist Check Maize Sampler to make simple rompler, but he has much less possibilities than Hise

Feature Request : A Drum Step Sequencer like arpeggiator module with associate sliderpack component :

Basic things :

Pattern length
Time grid (1/16, 1/32 etc.)
Magnetism on grid or free
12 or 16 tracks / sample slot
MIDI rec input from the keyboard or the drum pad
Syncronized BPM with Daw or free

For more, Hise's user can customize it :

Colors, background
Volume, pan, pitch on each sample slot
Drag user sample
Repeated note
Drum machine groove
send CV / Gate
FX send
and I must forget ...

https://forum.hise.audio/topic/3511/drums-sequencer-in-hise/8?_=1623432809025

@Rudra Ghosh Wow, thanks man !

@d-healey Ok thank for taking time to find a solution. Adobe media encoder keeps the original metadata normally, but not the loop start/end too.
I 'll share the wav files with my plugin, it's too complicated to use SoX with the terminal or import/export in an DAW with the amount of samples I 've to convert.
Thanks for all things you do for Hise community, i follow you on Patreon.

@d-healey I use Adobe Media encoder.
With SoX isn't too complicated to convert hundreds of samples ?

@Christoph-Hart Ok, I'll do this. Thanks
Edit : With conversion I loose loops metadata.
To share my plugin, I 'll have to give a folder with the wav files, I can't use the HLAC monolith : (

@Christoph-Hart Isn't possible to set bit rate of sampler module to 16 bit 24000Hz with script ?
And force sampler to extract sample maps to HLAC monolith in this bitrate ?
All of my samples are in the same format, I 've hundreds of samples to convert.
Conversion will make a fake 44100 Hz.