maps single moisture value (0-100) to tempo and key variables of a simple algorithmic sequencer

MoistureMusicMap.json

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        "type":"ui_slider",
        "z":"185b40f6.0c777f",
        "name":"",
        "label":"moisture level",
        "group":"e97b599c.1d6968",
        "order":1,
        "width":"5",
        "height":"1",
        "passthru":true,
        "topic":"",
        "min":0,
        "max":"100",
        "step":1,
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        "type":"inject",
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        "name":"",
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        "payload":"0.02",
        "payloadType":"num",
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        "crontab":"",
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        "type":"osc",
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        "name":"tempo",
        "path":"/tempo",
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        "type":"udp out",
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        "name":"",
        "addr":"127.0.0.1",
        "iface":"",
        "port":"7002",
        "ipv":"udp4",
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        "wires":[

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        "id":"9ae8df7f.95c09",
        "type":"function",
        "z":"185b40f6.0c777f",
        "name":"map to musical scale",
        "func":"if (msg.payload <30) {\n   msg.payload = 'minor'\n   return msg;\n}\nif (msg.payload <60) {\n   msg.payload = 'major'\n   return msg;\n}\nelse {\n   msg.payload = 'penta'\n   return msg;\n}",
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        "noerr":0,
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        "y":175,
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        "type":"function",
        "z":"185b40f6.0c777f",
        "name":"exponential tempo map",
        "func":"var inval = msg.payload\n\nvar beta = 4\nvar base = 3\nx = 100-inval //x from 0 to 100\nout = 100* ( 1-Math.pow(base,beta*x/100)/Math.pow(base,beta));\nmsg.payload = out\nreturn msg",
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        "type":"osc",
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        "name":"key",
        "path":"/key",
        "metadata":false,
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        "order":3,
        "width":"3",
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        "name":"",
        "label":"key:",
        "format":"{{msg.payload}}",
        "layout":"row-spread",
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        "y":174,
        "wires":[

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        "id":"1b210c9b.a106c3",
        "type":"range",
        "z":"185b40f6.0c777f",
        "minin":"0",
        "maxin":"100",
        "minout":"0.01",
        "maxout":"1",
        "action":"scale",
        "round":false,
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    {
        "id":"71913148.9dd3f",
        "type":"comment",
        "z":"185b40f6.0c777f",
        "name":"Maps single moisture value to speed and key",
        "info":"controls python sequencer via OSC. (see IP/port set by udp output node)\n\n* input moisture range from 100 (wet) to 0 (dry)\n* output tempo = ~1 note/sec (wet) to 10 notes/sec (dry)\n* key = pentatonic (wet), major (mid), minor (dry)\n\ntempo is scaled exponentially (see function node for details)",
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        "type":"range",
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        "minin":"100",
        "maxin":"200",
        "minout":"0",
        "maxout":"100",
        "action":"clamp",
        "round":true,
        "name":"current moisture range is 200-100",
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        "type":"link in",
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        "group":"e97b599c.1d6968",
        "order":4,
        "width":"3",
        "height":"1",
        "name":"beats per minute",
        "label":"BPM",
        "format":"{{60/msg.payload | number:1}}",
        "layout":"row-spread",
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        "y":324,
        "wires":[

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        "order":2,
        "width":"1",
        "height":"1",
        "name":"input moisture",
        "label":"",
        "format":"{{msg.payload}}",
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        "name":"MoistureMusicMap",
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        "disp":true,
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