You can achieve all of this relatively easily with the modulation system. Here is a snippet for you. The snippet is a little more complex because I am controlling the volume of four layers with one XY pad.
If it's too complicated and not immediately understandable, I can build you a simpler snippet tomorrow. Just let me know... :-)
In the end, this can be achieved with relatively little code, and you don't need a timer or anything like that. You can also use this method to control your pad with all the modulators that HISE has to offer. :-)
HiseSnippet 3261.3oc6bs0aabbEdojnikRSQbaJRQ.Jv.ihhkITzjTT4hTcrrDkrIhtPXJaKEifjg6Njbg1cF1cWJRlF2l+JEnn+G5SwE8OP6C887TeNOkGa5YlYWtyRsjhVxVV1lDvzbOy4Ly24xblyLCop5xLHddLWsTKre+1DsT+rz05S8asQKrEUqRYsTuY5d82gYtOwyWa89swddDSsTol8NbFRM+bZhW+vsVGaioFjHRZZOfYYP11xwxOhZ009LKa6svlj8sbT3tzZULXzMX1rN.XlMcds1XiivMI6h4rMSZs6h8Zok58SmujA9iK1X4kV5S9jOZYy5DiFEH0+HCb9kwMVFCTKgKsbgRZotxllV9L2Z9XehmVp4VmY1uVKVWpb.dfkmUcaB+gBZ0fQVRdKlsIWE4T01nkksY0PqjmF.3pQ1rYk1r2I8NVlVCnGY6daQCnHITMfolIN7lMF7JnBu7JvKAHkRARyIgz0RWyv0pseTKReYEpOwsAF7SpPQxq1L+8qkdCFvA0OmC9HxVtvCCjP+CymOKBdKypKr.3q77QGicQMAk0CcSjHrIWSh+sss2rQChgum90qY4z1lf3wJWOtXGyr+LJqNWxGs.BdENvPOrAyoMiBOnecduW35YxdJrT7zYYoSmkRWOyBeQLTVESI1E.LlrPxl4ZVjHGLRtOHNiGNRFOjynKoIxqEqisIL6qiMDi.7W.P2B23Fnal7KdS6fa21h1bwMA2hOw1tCsIgNNYhPzNU18KKuNLLKVHe9b4WMVSkkMAss7PMc6CBZBgDRwGr0IVn5V1VTB1k.7X4YzBPBxyhZhrnHSAQePov17.DRWKiVvS4yUb4UFZbeHB5bdCPWaQ48IpQGpguEihLrwNs0ONKxlkE0xJyB+QgO1k32wkB1BHjzwhp2xJavC3d5bVONCXhe7H5u7EzOdndZv3.ZXVTgb4khCZZ.zQ54ykqPFzheJxbcjtvBBbgfjevTDWL02h35OPqqC1GvRBr1kPont2jqem.McIVMa4uOqbc8st+tazMDT1LCrMpKXVBwqrYv.wa1pARuK52yMZ.BFXLDd2UU33SuoPSh3P3IC5DP0pZQL.syifjNxUBa.527bMkqkQzJtLmFWsBoUHfOdjgJxjt0LBRRMJRq7AspK5FRVVU1y4JLfoXJC5CP5AQlKFPJC58Q9Rk7wh2I1djQNP.XVL.LvPpC3cvyiYnKGNzxH+ECHEanSH1xi3uMtOwE7l17+uB0jzKKh65LqG20ZVOz2pKaNaf5kMvIkIxKcm6WAgOxuC1FVvf3RnHcVKXb2.lYUGVCcwZswNRacXR2GEM9eQN.VO.a2gnCfHpWKWqJGveMu6TxhmYfazxqLoAnel5hU.T6xLC6Yg9qBeNOE4PrfrRTzV+y+JLumhNxFRW4iLwdqLf6SzebHdaeeWq5c7Imb3xwAVVTD7CFxs.CfGLpbmvcqTayEe.w0CbD2XqC3CHhJl25falE9niCxCVH12DVsjPWQseNE7jOXnGoeuSaSH6sv06AKo5bvgBmZucYtNR2ee9GiGAHZcnI3BZAijjq9IvU+.tB8jhAdwOuCy0jBofGLId6BqfX0Ae.f1i7xh1tXvytDvtvIrzJnN70mFvQoPBRVTyEwWjLX9iDlvjgfm6eBX2sHm6.K7Dv9RI04Ahm.6kRr2Gheg.JSIA2nR51tExDzmJrTHNKESfkhwYYoDXYo3rTJyfkRFyp5Gb3hUwlnOm.wrzwudtrnDdLZUHv0+drN9P3ndX3ndyv.M95qXvT42xxiWAx1bq25rNTSO87gVnl7NRVVtt7+7xU2FRqDnXMy0.pm+dP4d53wIS2VV9jAxX5h6JkAVLMRLdWsossUaOh9iDvBl4fy0C76E.+SDk9ATJJ92WvsfYVcBsg6f63MY1ucXc7HgoQiLfjigpzBMh7TgBB4LrsLNhXh9luAII.JYygyDppT2LfudqlPy8GzbekrZbWVucijDVzJz68PKS+V5YVMFu8i3suBu2UD+oqlu7fn0A5sqRubXD896pJPBY05saVTeUgEimKoMONTePJxgralrNv1b1fa8Fu0ZHMERhgJNJS2vZpj2jz174VNY0U1v3zWfCdAgKepZL+8.sNPoawNl3JU24OQU94WMdkKymz9.lj.dPqODUy1hWsMTFFO5+CP2WnHiSzgW.iQOfuQEWlstQ3tTfRn4VonoA5wAopqb9foTC7jBQgbxAzGN5c9Dr0BQxB9mlg9mLJq4dfLii.iClvFA6LIryAF8vmcJU+DUpnoYiRqNPQcBG7Hs5vj0pCUzpwG.TgZ4uhbGGSPFuAtmS3VPfZAw4qtvv57I00PNOwLrSLyZ7SnB5YkoRKnjYle1QtCLIR5wnkjGOA1z4t54GdR6iiFJerqbvzKwWRTI5YWlOYOprC.IPC2TiFI1VfuyF5wjZVNViQPcZGm5DWkHUAiZolK9oIkdzmlj5gcYHO.BEFYTdTydsIzQcDXZAmZglVpqDfJfUew4N8yCN2IYRGMKw4ncfl.rQG122eKsIRvCOaB9FoEGajpv4+wGWZwmL4BW77H7RpB2p1+9er7SgvkRP36WoLLiieReAldvczl35aw8zoJSN1xfHO2u4SWl3cjOqMzcCNQI3yxA8sBOUPdzsXLuZZYjtVuHir0Z8UenKOGfJgVho5pTfYSrtgyo.H8doEKmCaY3t704P+NTYnVnlVzl7fmgQ0HhYTPDUAQe+WulIoAtisLYhZrgCF1SVu8wtP9nJhdomFT0oS3oJO+Uzz9oFBlmPTb3nPwZ+4mBTzeXT7SmDEKbpQy8TOZcEOTk0bTOI9CehCNFqNLyf.CCq5fa2wxzzlTk4YwyrDwYtmzNbRNG1.Rh11eAs1XWrCwmHZ6JoEm9+SC9Kphey0tfwewyM9WRE+9Wz3eoyM9Kof+u8wWz3uTx3+j2awamNnVq3WiBm8fF3io5cWvueBJfk9pWF0yr6VYRg30RW0x2nUxXblDvHjL+4AFCtQp2Js7JXh.3bo25fmOW+j5veU4v+douiMqN1NxPAKaAHgHuFpeSPynAsiFvPgwbIi+qI8RFaOwWx3vkMM2jU1zobGgyco6NBmz33e4IbMdWfy1RMiBLulDloSu8V6EXofOEArBmNvV2pMyF6xaeKWxenCgZD19W0nw+8V7HjJT0noGhOlzf45DTM0fdZaRSXLUorOAx8VqO0PU7ZNLFraBZy3wcZZayXs2jhAqfoZmTsE1iuUAXKMw5Fna2msC1CxWtgMy3H0FqzjxbIxsenReiNd9LmPEPbk407IsEUNl5Qo+vR4fWM9.96exFvaKs2ylmeZRjUXxc+iOJkGILvkyiItDtlfDkCB7dAhxSapTwy0TIs+xd+uoSkdcdpzbSVP53W07BcZ0EJhGawgy9pcwgxqep4NhMECof1siSMn5KCBL5TJwleTUolgOmS9bd9yhItDpo3geBdEzXA9yoBZrPXiZxNO3HRlAJkjRLj6M4MheX.6H1Jib7jnPbgtgC4vdhu59+mu6V2tSu.lFDM8cBZI30pPOl+k7PXB0FIN5ONbjJAb.u9amcbnD.7tx.f2LMO0l3Krkv8+qRGlpCcGBTC9Iqt54dc36Y3CPXeWL0qMyiTHVJbhi09v1b8hQcHIJlnDwnVl32gFuqkjJN7xVaAlBE9t5ZgDKpRrJlFqyfmi0S6X0S8bgjqYUi.Zt4ddFfggami0Acr8HhibufpfQjKpR9tXWygWzL0rOO1NyUdoc6Lu.O4fXeqLmODixyDYSX9oMCnvw3uHcY4IIFRM9TucXTV6VLpULG88HPJulMItpXOQE5199X0pddm0tGwl.0JEQ52t11hueWxzRmIaQgm5ugpI5u90okvEwyWfd48Ded0dQ8XtyqN36MtHz9NgC+Pme7nVM4OUZwmTlXiiYndX7qb3v0RX8F4ZbU4aJYXy7rOqBamahiE3pz4Jd8BsfTdJGvj+xDfEgDu7.32leuZWBf6EQ42SrIAJH5xcN82MMTXVQjHwN5ESl8KXG1SwNBJdYYGA+v2McGAS2QvqS6Hn3zcDLcGAuZsifhS2QvK530mE6B3B.jm+J+u.VT47Vs+KMELNsB+WcqveoKMU3eqoU3OsB+WmpveooU3OsB+Wspvejql7s7eSCSqveZE9SqveZE9Sqv+hrB+RWZ9V8r1zJ7mVg+qSU3WZZE9Sqv+UqJ7KMsB+oU3OsB+oU3OsB+mCNrKhwvAa3x9RC4eaJ34FupfBn2Twe1cmO8N7mQEF9ODGZ7eF3VeogQ7t5DBV7rJ3RmUAKcVEb4ypfe3YUvO5rJ3Ge5BxqW+1c7YNx4Fv9Vpto72uVpA+34RMq1+2DSycn