@Chazrox This info really helps me understand tho :) thanks
Here is a snippet with 2x file_players and the controls

HiseSnippet 2985.3oc6a07babaEeWIsxVJwNezzON0fQsGnpMk4BRJRFmVS8YhhkjYHUURFWOxPbAEQ0xEa2ETVrY7L9RmoG80bnyj+L5w7WRmbuWxgzC8TJ.1c4hkeJQaIl1oalIl.38v6g2u26gOUEOZcruO0SSewC53h0zeSiZcbXM2nIh3nsylZ5+biG5POF1fXiqYSYoq4PbcwLs063h78wVZ55y9QBh0WXNM4228f0Q1Hm533pzzNjRpi2kzhvhqsR4GRrs2FYgOfzRg5bk2oN0YCpMsMWwl0HilKp9onSv6iDjMig1Gi7apo+aLfl4K0vJeVyhvbEyTxDuZ9UsZXUf++xdrokoUQqR4JfyooO+VVDF0qFCwv9Z5ysN0pSslzm4DHfCI9jiswhBlZ03RNn5so1VhgnnVsMZRrspDYw7038RkX62rA1u2yXOhEoa8w1w2V1.HlCUCn9LIUuYSndlppWFE0a.pjthJMWfJ8NF0p6QbYwsHzm2vXGGF1qAhiSppR.sZy78+BiMnbJbXqzBcJdaOdgtbjJelL2EjKSlku+hKt38FzGn1Z6UY2spARCLA0NXspG..f6M1OQuk9Z5aQtWlOCbFxCDLp29yMA+VfL.XkSvr0ZaQn0PsbswcscoVJfT.m1k3i9ftvmGY3yY8wOgaOZP8.oH7RYtOf.9PPN9+bm6r7he4hbKP.oOl7DgfhDZWgsMOJKEg2sO+5zLvkEXWJxBH0AQjtOf3vn.WJ0FbEK7sbNg3fWwlK+tl.etiFsBW3o3lhqYCQkcW6K1pZZSPWmC+qXodu6E6GJMA6RotUrQcvdIbGkA6xRoVRRGPPHHjxXmQQ+TE4XQaw4NJFVvOskK0gWH0RAM2COOzol4P4PzXRx2GeNanjKZrG5q3gOanzKZTR+TAsAv+W.sgiAtg8A2vQA2v9ga3HwaX+3Mbj.Nb5A3lf077Pc.AY2Eo6.wYeRKm12609jLD9Odblm.DSTrzmQNh4gbKloXZyUdF5rktqZUv9qJa+Ukq+px2eUqJq5ISuXqoko1L1T+PR8SUsyxxvdJmsmx45ob9dJOkLrccgEKL2LztB7w135LB040uLIN17onAMZ6HE.f5HlMPDW6wmhtdTP8c4Vd61X0E5v81WwGyjKqYourR0G8IaswAGs8i1cysp97ktSX.wik78Dwxdt+hiZ5GQeEJ1MP11Gy2UPpDJy0a9jtPAb5BEvwAEWhUzNV3x7BBWvQ.WvoBbkL+e3JjVuMicE.TwRMPNC1TDz1QwViAfuIoYPPr.gkvLoAHUXkhhAXu3SDgHzfCEMlJ0dHt2fGue4KyNEeeb4WdYtrSPb8lHmSvVoBq+4Bn9ZMxpKPAulQJ3nfJ3EAqfuxfE7x.VvoMXkLtRrvtzW0X0PxEJj83xEN5fjShr6KC9ccqI0RsHNKsL3A8DH0KGoAlKC9fgPDuSPmuj.6VXjQYib+QC12TYXu7TJLEN0wc3qBvC6C3g8A7vDXJbv.+.HpefGdIAd3n.9eLLWpX2egXO3ZG7EB+Ri8KLnH9ODzSv5Xi3uyXh3EdOSXDe3InLXfWYLO81BMb5i6vIF3g8A7v9.9QDwemwDw2CvCuj.ObT.+zKheHeINp+zfs1eywbP+pnHkgejSJAdsvhOeQPuM0nw.aKzDXi8FXyh6SxaTLlxocqiwdJdKRB0zmK4EwXL7KhQ8dhpGfjJDRc1wgvdjK1YX2djVH7qoo+FgZkl97L4U17SCuxF4909LzY3FTuVZDKw0HknNSM4.P8l1rPLjl96az692RbpEZdB2Q9nziwGj5B9j0rkiknb4+1bA52DoTvgoTEL9x.WkHcZcOL5T+6Uk35RbVqNwJWlbGYtZ9iD+9TBO4xEPY+U+KcEkc1.k81gJaMahE1Spk2PdSlIsXe6m92+GOXnLGjZKjYYB49GYWLlkqeaxXdAivSq+RvtxnddCwDOuB71GZ9dkuLpM7UwjMwLKySN.l+86rovSTSWOL5iGQ5h8XDQvt9l3yH0wA2Z5BFah8OkQc0zeqtYm0zeyKc.54wJvlk6zsvKNr7yHVrlcq3a7J2DSNooxEjueY2nDF6XIua9tmTiFggaEcE4KXXluPoLYgZXGDO8TUQzQPloiOoKQyy6wePzsL4pGBp8MMxAKAWMSQX97J8ITP+Ke4K+gPSd2w+stz4BFx3Wy4Ua76KOEqcbrvmGjgcJYPt8Xy2Da.d4eQw.7suXDiNWjGpElgks7FF6hajtpz1jzlosSe1rcJmzPjMa974xkUYbung4pEJT.Z163yvzzrXthbaKedrC31j0omGXzTMPJrel5yRP0n7Viwnn5UT9EpdEVivn7ipwtO2AeGwNv3qSK5QpnfYhzGmlFlN2vMR2XrS1LrPm86IzgmKoWSQtxD+8ns3BB40IZIHWLYGLWUrr+5mpl15pT1wS0EK8u8zWuR+lialREiNS0nuYY9VCTmEzmgcqQ9yX0W9Tn1YnawKFoYF5vdRZbywMk6PThu4jWiJwMt.ycODb3o+wqbOP3v7.uhkcvJGFRjW4WcYaDH6aEJ6cQGiskh9lFxeq5.9MOV0A7CKKREIHTbAMfKW2pNjdgZ2VFmragCxRMztM6vrTeMKra2v3inH6OH3AFk6bf34Ecjq7UL3CdFg0DPbrHmQrZirA9pWfl3MYHVomuVWGZOcUG5eo7QD126c6sM1iZ01FwR976DORwvF3aELwadS7t1b7IrNpQQ89l7l6h8l7F8SF7hptuiQEBqdyAquyL.8kuj1qZ8M7ENdKisZzfCOwJ6bFa+4WQOmwYTj+7AxeQin2MmT3IVgfpRre6Vwuy.g6hvRwqbShuv8a817QgmrAwNJCe1i5+Ui3SKv0CymSGe.U7naRE3aVkOhtK3XaZ8SEoc6+HFBW9x5BJRIN0GGrs+jbRDyegsglizFpUk1lQbNYODyiviVM31fZ7UyTGuQn1IrAyHlaHnblnMYWC6XIK7C7uvFM6Zv3MZF0X7YYnsOl8Lp2ox2hZ3u4YKBPJeoQ9nFmyUetsW3Vyy3lYE9+oslsM8YhLOjPGdNDJqqB0tiaSpCotnp.JhT80ZQaKy9I0+3nk0ivmngxGi7O.QrEAO0Z66x08G4Ti2OxWorvgcepE+W2XaTctMuSEjHey6XHx.w8xwdhyuKzaOwvH1gSX7CdexIHPfXUhVXne.ZIjUzJJCTO9npkLe6LFbRDsKc9CTp4ER8VFJIN0RnluKWM8vqn19fTqj8v3zAgc1FedztkUhjTKwi8U1A1VbGYKdxDIS54Fxg8TqIg8wT1FHuiLyCO1sU5i45pIRdRO6QbNLXS6BEeOz4gktogIrHrDOEkhwT7.riJwMSw7ZH7oT31v.xKWq6RkLLL4kEl0aaHhsEGt5dBa8g8dfAahafZayRzuZWTgZNDgNOetHVWgETeuBxrGAYDKn4MfIkzM4UjISXm+VFUoT11d3+Tat2cmHobKihkJtR1rkxrJLeOR6FF4xcoFXIsl+LQ6YJE7Unvp43actHL7QlKTjphXxHE4mvotT.0EJsZ9RkLyOjAe7IynooDIbaU+XyIJTnmt30erPlKXrvmz9Dah+Z0os8Yj59GUrDOd3n0xNxXgvim8+GHLgABqtZoUJXloT1BS0.gQMbUc8Uw4DsH+a8PThuLvYBlYZG+CEsVGYGIE9DiqSom1BImRdhN+S00.9tQqAayNNnVbW1vQWTQyd96Bhg2Rd.bVp9RhpOnoG1uIesm81vZLF2ITcg3hZqx2Q.xWwi7KJKhJ8jpUeh36dPbiCTPwMG.IAM80e0W8uU3Lgl7h+4mNihHSpOf+v6+zxx+3lvdCX7F1x.0jv15eTG1PeC7eshVrG5Tba2Azc82f9r+2zxIuNjQKTcO5Qc2iIO6grF931QNIwBF6IJCFvcmzhXQNpd8jcUeLBmTFyNoLlaRYL+jx3pSJiElTFKNdFE+g1sVaFsUvFI3aLnxVAyCq2M5TeVs+S0TKY+

@d-healey Thanks again, this is where I was going wrong. Learning slowly but surly :)

@Rognvald I found this as a starting point.. :)

const var Knob = Content.getComponent("Knob");


const TH = Engine.createTransportHandler();

//	18 = tempo factor = 1/64T
TH.setEnableGrid(true, 18);


//	Set sync mode Internal or External
TH.setSyncMode(TH.PreferExternal);

//	ON GRID CHANGE FUNCTION
//	You start and stop this using "TH.startInternalClock" & TH.stopInternalClock
inline function GridChange(clock, arg2, arg3)
{
	local v = (clock % 200) / 100;
	
	local value = v < 1.0 ? v : 2 - v;
	
	//	Trigger the knob
	Knob.setValue(value);
	Knob.changed();
};

TH.setOnGridChange(true, GridChange);


inline function onKnobControl(component, value)
{
	Console.print(value);
};

Content.getComponent("Knob").setControlCallback(onKnobControl);


//	START STOP INTERNAL CLOCK
inline function onStartInternalClockControl(component, value)
{
	if (value)
		TH.startInternalClock(0);
	else
		TH.stopInternalClock(0);
};

Content.getComponent("StartInternalClock").setControlCallback(onStartInternalClockControl);

Is there any simple function for this, or using Timer?
Can anyone provide an example? :)

Good morning Sir and thank you! yes "loadFile" not "setFile" and "slots[]"
Maybe I will sleep now :)

inline function onKnS2Control(component, value)
{
    slots[1].loadFile("{PROJECT_FOLDER}"+inst2[value]);
};
Content.getComponent("KnS2").setControlCallback(onKnS2Control);

@Chazrox the code i posted above is functioning swapping samples from both array but only to one file_player slot#

@Chazrox This info really helps me understand tho :) thanks
Here is a snippet with 2x file_players and the controls

HiseSnippet 2985.3oc6a07babaEeWIsxVJwNezzON0fQsGnpMk4BRJRFmVS8YhhkjYHUURFWOxPbAEQ0xEa2ETVrY7L9RmoG80bnyj+L5w7WRmbuWxgzC8TJ.1c4hkeJQaIl1oalIl.38v6g2u26gOUEOZcruO0SSewC53h0zeSiZcbXM2nIh3nsylZ5+biG5POF1fXiqYSYoq4PbcwLs063h78wVZ55y9QBh0WXNM4228f0Q1Hm533pzzNjRpi2kzhvhqsR4GRrs2FYgOfzRg5bk2oN0YCpMsMWwl0HilKp9onSv6iDjMig1Gi7apo+aLfl4K0vJeVyhvbEyTxDuZ9UsZXUf++xdrokoUQqR4JfyooO+VVDF0qFCwv9Z5ysN0pSslzm4DHfCI9jiswhBlZ03RNn5so1VhgnnVsMZRrspDYw7038RkX62rA1u2yXOhEoa8w1w2V1.HlCUCn9LIUuYSndlppWFE0a.pjthJMWfJ8NF0p6QbYwsHzm2vXGGF1qAhiSppR.sZy78+BiMnbJbXqzBcJdaOdgtbjJelL2EjKSlku+hKt38FzGn1Z6UY2spARCLA0NXspG..f6M1OQuk9Z5aQtWlOCbFxCDLp29yMA+VfL.XkSvr0ZaQn0PsbswcscoVJfT.m1k3i9ftvmGY3yY8wOgaOZP8.oH7RYtOf.9PPN9+bm6r7he4hbKP.oOl7DgfhDZWgsMOJKEg2sO+5zLvkEXWJxBH0AQjtOf3vn.WJ0FbEK7sbNg3fWwlK+tl.etiFsBW3o3lhqYCQkcW6K1pZZSPWmC+qXodu6E6GJMA6RotUrQcvdIbGkA6xRoVRRGPPHHjxXmQQ+TE4XQaw4NJFVvOskK0gWH0RAM2COOzol4P4PzXRx2GeNanjKZrG5q3gOanzKZTR+TAsAv+W.sgiAtg8A2vQA2v9ga3HwaX+3Mbj.Nb5A3lf077Pc.AY2Eo6.wYeRKm12609jLD9Odblm.DSTrzmQNh4gbKloXZyUdF5rktqZUv9qJa+Ukq+px2eUqJq5ISuXqoko1L1T+PR8SUsyxxvdJmsmx45ob9dJOkLrccgEKL2LztB7w135LB040uLIN17onAMZ6HE.f5HlMPDW6wmhtdTP8c4Vd61X0E5v81WwGyjKqYourR0G8IaswAGs8i1cysp97ktSX.wik78Dwxdt+hiZ5GQeEJ1MP11Gy2UPpDJy0a9jtPAb5BEvwAEWhUzNV3x7BBWvQ.WvoBbkL+e3JjVuMicE.TwRMPNC1TDz1QwViAfuIoYPPr.gkvLoAHUXkhhAXu3SDgHzfCEMlJ0dHt2fGue4KyNEeeb4WdYtrSPb8lHmSvVoBq+4Bn9ZMxpKPAulQJ3nfJ3EAqfuxfE7x.VvoMXkLtRrvtzW0X0PxEJj83xEN5fjShr6KC9ccqI0RsHNKsL3A8DH0KGoAlKC9fgPDuSPmuj.6VXjQYib+QC12TYXu7TJLEN0wc3qBvC6C3g8A7vDXJbv.+.HpefGdIAd3n.9eLLWpX2egXO3ZG7EB+Ri8KLnH9ODzSv5Xi3uyXh3EdOSXDe3InLXfWYLO81BMb5i6vIF3g8A7v9.9QDwemwDw2CvCuj.ObT.+zKheHeINp+zfs1eywbP+pnHkgejSJAdsvhOeQPuM0nw.aKzDXi8FXyh6SxaTLlxocqiwdJdKRB0zmK4EwXL7KhQ8dhpGfjJDRc1wgvdjK1YX2djVH7qoo+FgZkl97L4U17SCuxF4909LzY3FTuVZDKw0HknNSM4.P8l1rPLjl96az692RbpEZdB2Q9nziwGj5B9j0rkiknb4+1bA52DoTvgoTEL9x.WkHcZcOL5T+6Uk35RbVqNwJWlbGYtZ9iD+9TBO4xEPY+U+KcEkc1.k81gJaMahE1Spk2PdSlIsXe6m92+GOXnLGjZKjYYB49GYWLlkqeaxXdAivSq+RvtxnddCwDOuB71GZ9dkuLpM7UwjMwLKySN.l+86rovSTSWOL5iGQ5h8XDQvt9l3yH0wA2Z5BFah8OkQc0zeqtYm0zeyKc.54wJvlk6zsvKNr7yHVrlcq3a7J2DSNooxEjueY2nDF6XIua9tmTiFggaEcE4KXXluPoLYgZXGDO8TUQzQPloiOoKQyy6wePzsL4pGBp8MMxAKAWMSQX97J8ITP+Ke4K+gPSd2w+stz4BFx3Wy4Ua76KOEqcbrvmGjgcJYPt8Xy2Da.d4eQw.7suXDiNWjGpElgks7FF6hajtpz1jzlosSe1rcJmzPjMa974xkUYbung4pEJT.Z163yvzzrXthbaKedrC31j0omGXzTMPJrel5yRP0n7Viwnn5UT9EpdEVivn7ipwtO2AeGwNv3qSK5QpnfYhzGmlFlN2vMR2XrS1LrPm86IzgmKoWSQtxD+8ns3BB40IZIHWLYGLWUrr+5mpl15pT1wS0EK8u8zWuR+lialREiNS0nuYY9VCTmEzmgcqQ9yX0W9Tn1YnawKFoYF5vdRZbywMk6PThu4jWiJwMt.ycODb3o+wqbOP3v7.uhkcvJGFRjW4WcYaDH6aEJ6cQGiskh9lFxeq5.9MOV0A7CKKREIHTbAMfKW2pNjdgZ2VFmragCxRMztM6vrTeMKra2v3inH6OH3AFk6bf34Ecjq7UL3CdFg0DPbrHmQrZirA9pWfl3MYHVomuVWGZOcUG5eo7QD126c6sM1iZ01FwR976DORwvF3aELwadS7t1b7IrNpQQ89l7l6h8l7F8SF7hptuiQEBqdyAquyL.8kuj1qZ8M7ENdKisZzfCOwJ6bFa+4WQOmwYTj+7AxeQin2MmT3IVgfpRre6Vwuy.g6hvRwqbShuv8a817QgmrAwNJCe1i5+Ui3SKv0CymSGe.U7naRE3aVkOhtK3XaZ8SEoc6+HFBW9x5BJRIN0GGrs+jbRDyegsglizFpUk1lQbNYODyiviVM31fZ7UyTGuQn1IrAyHlaHnblnMYWC6XIK7C7uvFM6Zv3MZF0X7YYnsOl8Lp2ox2hZ3u4YKBPJeoQ9nFmyUetsW3Vyy3lYE9+oslsM8YhLOjPGdNDJqqB0tiaSpCotnp.JhT80ZQaKy9I0+3nk0ivmngxGi7O.QrEAO0Z66x08G4Ti2OxWorvgcepE+W2XaTctMuSEjHey6XHx.w8xwdhyuKzaOwvH1gSX7CdexIHPfXUhVXne.ZIjUzJJCTO9npkLe6LFbRDsKc9CTp4ER8VFJIN0RnluKWM8vqn19fTqj8v3zAgc1FedztkUhjTKwi8U1A1VbGYKdxDIS54Fxg8TqIg8wT1FHuiLyCO1sU5i45pIRdRO6QbNLXS6BEeOz4gktogIrHrDOEkhwT7.riJwMSw7ZH7oT31v.xKWq6RkLLL4kEl0aaHhsEGt5dBa8g8dfAahafZayRzuZWTgZNDgNOetHVWgETeuBxrGAYDKn4MfIkzM4UjISXm+VFUoT11d3+Tat2cmHobKihkJtR1rkxrJLeOR6FF4xcoFXIsl+LQ6YJE7Unvp43actHL7QlKTjphXxHE4mvotT.0EJsZ9RkLyOjAe7IynooDIbaU+XyIJTnmt30erPlKXrvmz9Dah+Z0os8Yj59GUrDOd3n0xNxXgvim8+GHLgABqtZoUJXloT1BS0.gQMbUc8Uw4DsH+a8PThuLvYBlYZG+CEsVGYGIE9DiqSom1BImRdhN+S00.9tQqAayNNnVbW1vQWTQyd96Bhg2Rd.bVp9RhpOnoG1uIesm81vZLF2ITcg3hZqx2Q.xWwi7KJKhJ8jpUeh36dPbiCTPwMG.IAM80e0W8uU3Lgl7h+4mNihHSpOf+v6+zxx+3lvdCX7F1x.0jv15eTG1PeC7eshVrG5Tba2Azc82f9r+2zxIuNjQKTcO5Qc2iIO6grF931QNIwBF6IJCFvcmzhXQNpd8jcUeLBmTFyNoLlaRYL+jx3pSJiElTFKNdFE+g1sVaFsUvFI3aLnxVAyCq2M5TeVs+S0TKY+

@Chazrox Yes, I am not sure how to call inst more than once.. i keep getting error - Duplicate const var declaration.

// PLAYER 1 Array Samples in AudioFiles-Folder----------------------------------------------------------------------
const var inst[0]  = ["Wi_trap808-1.wav","Wi_trap808-2.wav","Wi_trap808-3.wav","Wi_trap808-4.wav","Wi_trap808-5.wav","Wi_trap808-6.wav"];
//--------------------------------------------------------------------------------------------------------

// PLAYER 2 Array Samples in AudioFiles-Folder----------------------------------------------------------------------
const var inst[1]  = ["Wi_Kick-1.wav","Wi_Kick-2.wav","Wi_Kick-3.wav","Wi_Kick-4.wav","Wi_Kick-5.wav","Wi_Kick-6.wav"];
//--------------------------------------------------------------------------------------------------------

@d-healey The buttons are linked to the knobs which should change the files in the slot. I thought..
Thanks I will create a snippet :)

@d-healey Yes as in the image I posted

same for all 4

@d-healey Sorry i am still battling with this same error "Unknown function 'setFile'..

//--------------------------------------------------------------------------------------------------------
const var ScriptFX1 = Synth.getAudioSampleProcessor("Script FX1");
const slots = [];

for (i = 0; i < 4; i++)
{
    slots[i] = ScriptFX1.getAudioFile(i);
}
//--------------------------------------------------------------------------------------------------------

// Load Audiofiles into pool ----------------------------------------------------------------------------------------------
Engine.loadAudioFilesIntoPool();
//--------------------------------------------------------------------------------------------------------

// PLAYER-1 const vars----------------------------------------------------------------------------------------------
//const var AudioLoopPlayer1 = Synth.getChildSynth("Audio Loop Player1");
const var Random = Content.getComponent("Random1");
const var KnS1 = Content.getComponent("KnS1");
const var Next = Content.getComponent("Next1");
const var Prev = Content.getComponent("Prev1");
//--------------------------------------------------------------------------------------------------------

// PLAYER 2 const vars----------------------------------------------------------------------------------------------
//const var AudioLoopPlayer1 = Synth.getChildSynth("Audio Loop Player1");
const var Random2 = Content.getComponent("Random2");
const var KnS2 = Content.getComponent("KnS2");
const var Next2 = Content.getComponent("Next2");
const var Prev2 = Content.getComponent("Prev2");
//--------------------------------------------------------------------------------------------------------

// PLAYER 1 Array Samples in AudioFiles-Folder----------------------------------------------------------------------
const var inst  = ["Wi_trap808-1.wav","Wi_trap808-2.wav","Wi_trap808-3.wav","Wi_trap808-4.wav","Wi_trap808-5.wav","Wi_trap808-6.wav"];
//--------------------------------------------------------------------------------------------------------

// PLAYER 2 Array Samples in AudioFiles-Folder----------------------------------------------------------------------
const var inst2  = ["Wi_Kick-1.wav","Wi_Kick-2.wav","Wi_Kick-3.wav","Wi_Kick-4.wav","Wi_Kick-5.wav","Wi_Kick-6.wav"];
//--------------------------------------------------------------------------------------------------------

//PLAYER 1 Knob1 Sample selection---------------------------------------------------------------------------------
inline function onKnS1Control(component, value)
{
    slot[0].setFile("{PROJECT_FOLDER}"+inst[value]);
};
Content.getComponent("KnS1").setControlCallback(onKnS1Control);
//--------------------------------------------------------------------------------------------------------
//PLAYER 2 Knob1 Sample selection---------------------------------------------------------------------------------
inline function onKnS2Control(component, value)
{
    slot[1].setFile("{PROJECT_FOLDER}"+inst[value]);
};
Content.getComponent("KnS2").setControlCallback(onKnS2Control);
//--------------------------------------------------------------------------------------------------------

@d-healey Thanks again, this is where I was going wrong. Learning slowly but surly :)