A basic two-parameter engine where "RPM" is the rotations per minute of the engine and "Load" is the amount of load the engine is under, from -1.00 to 1.00. The timeline parameter sheet is not being used so it has been removed. The instruments on the RPM track use Autopitch modulators, which use the fundamental frequencies of those loops. The transition between on and off load is achieved using volume automation. A distortion effect on the master track also adds some extra bite to the sound when the load approaches 1.00. https://www.fmod.com/resources/documentation-studio?page=authoring-events.html#parameters https://www.fmod.com/resources/documentation-studio?page=modulator-reference.html#autopitch-modulator https://www.fmod.com/resources/documentation-studio?page=authoring-events.html#automation-and-modulation Recordings by David Nichols of Track Time Audio. Engine is a 1988 Craftsman II 16HP lawnmower. Ride-on Mower 2 {24af3eef-4e1a-46c4-98e7-5211bb3a531c} {b25c4f9d-1f47-4b94-89e1-8b05ecc39502} {ff19646f-4dc8-43be-9d99-73cde9536edf} {1b2729a6-7abf-4220-9cbc-a415743f03d6} {ad75f74d-248e-4b30-b41c-42bf6c059018} {721cf887-761f-4cf4-a1cf-2e8790901610} {5e618944-886a-41d0-96a0-a08198069cb1} {4dcd8475-dc77-49ec-a40f-f01cc6aac550} {001a4c4c-ff56-427b-818c-e2fe66aa6bb4} {c993486d-84e1-468e-9f5a-d1b045016729} {8b9f00f3-0328-4a96-8fa7-84477875d85a} {9aaf46f5-9be2-4e16-ab8a-63a688316adb} {f17f59ec-069e-4b01-9100-e363ff965769} {9c7e8a7b-f972-4178-b145-518d110d2f69} {a025d556-71e6-46dc-8b15-29e8bf95dfec} {b7966369-4c11-43d1-9ad0-7e7774c5c9ac} {a79b361f-e88e-4aa0-aae9-aafdb4ad463c} {00f8d28b-026a-4a3d-8c6a-4bad93b39037} {6a524f5e-6e76-4c7b-b84b-f77a700051a5} {4f3c2cf8-29c0-0361-0e5c-36e8f36584ea} {89d0e20e-eb47-4891-83b1-65406223d5b5} {34f54f36-2a90-4a3c-a280-e09632cf8257} {1fac4b7c-c303-4771-af2a-0f31da764575} {e931fc7a-7f6a-0f9e-3b5f-35bdc202f8f6} {1fac4b7c-c303-4771-af2a-0f31da764575} {13629fd2-f9c1-43a1-905a-07991fc2e5ae} {444eaee5-b7d9-490d-ba5a-c70fa2dbbd0a} {37ebea86-d649-4a7a-b7b5-25701bfce8e9} true {855bcb1c-4309-0625-2e92-74263e4e2a2c} {440f93b0-47ea-4930-915f-ee90dba53043} {4850e341-4861-4d8e-8590-fb9d3653b1b6} {a8d21446-73ea-4c12-92ef-2a80d7d09bdb} {91240137-d929-4cb6-8fc8-0d4868376c40} {3c3167e7-2250-014d-335a-1aef10e1e30f} {cda5e2a2-f513-4193-83b6-a46c77172b6c} {78b43e7b-8172-476e-893c-8e03e16c3584} {cfdeb932-2637-45b5-9466-b46b8f233999} {c77bf38f-3394-49f0-8902-0c009f42f270} {fb5c4003-f776-4887-b16b-f0fc6458c48b} false {cda5e2a2-f513-4193-83b6-a46c77172b6c} {440f93b0-47ea-4930-915f-ee90dba53043} {4850e341-4861-4d8e-8590-fb9d3653b1b6} {a8d21446-73ea-4c12-92ef-2a80d7d09bdb} {78b43e7b-8172-476e-893c-8e03e16c3584} {c77bf38f-3394-49f0-8902-0c009f42f270} {cfdeb932-2637-45b5-9466-b46b8f233999} {27917f63-d316-4f46-95a0-a271283fb8ad} {3e8e56fe-6058-430e-af80-ca44be8ee759} {e0819f7b-a358-475f-8b42-ea31a43be588} {b491ed34-05cf-466d-82c2-9680fed87a84} {9aaf46f5-9be2-4e16-ab8a-63a688316adb} {d9df47e1-df77-4685-8290-f3e759186372} {0ee98f85-7edd-417c-8d7c-4254b97fe3ee} {b5b57087-e314-4f3e-975d-b27ca554b1a8} true 1050 950 3 true {8d589e63-43f0-479f-b710-f55cf74d9ef6} {0ffa4417-0d99-4801-b970-6e08a49e0c7a} {22b88e80-3684-43a2-87ab-35b42750d683} true 250 650.00006103515625 3 true {3c6450f0-6e12-44dc-ae23-df73fadf9be7} {a2ab8b5b-2d9d-4fb9-9005-2c689bd1f6a9} {b4dcd0d4-9d84-433b-abf4-77a4ce7e0071} true 800 800.0001220703125 3 true {89cc6950-4212-42ee-8152-9e0ccb915c1a} {d95c8bb6-d717-4823-906c-db03058b0e22} {5b36f22e-8735-4ee2-9619-1740acb22807} {94106a5a-92de-4da5-9542-368afa003311} Exhaust_Onload {b5b57087-e314-4f3e-975d-b27ca554b1a8} {997de3a7-e06b-4777-9b84-b5d863f5cd6a} {d93d7f85-2889-4fc8-b2d7-ad3c19b415f4} {1fac4b7c-c303-4771-af2a-0f31da764575} {0cdfdc7c-824d-4856-8a95-dcb58bfb788b} true 550.00006103515625 3 true {7e010226-e9f5-4f74-98c5-e2b976ca5434} {5776e796-c494-4e02-8e80-e925846ca3a8} {880bde4b-f203-44a8-9a42-b1a97ddb2670} true 800 850.0001220703125 3 true {eb780b76-052f-49c5-a187-875913291651} {13464464-5b30-4fec-aee8-cfed50c30e50} {2189e4d0-c0e4-4797-a3cc-f32c467c930c} {a6925868-56b6-4fa3-b118-5cefa17cff42} true 400 900.0001220703125 3 true {19c03283-b2e3-4dc8-b815-c217f606f8e4} {0aa58741-996e-433b-a52d-5b483fe3c52b} {5404286b-ebd1-4300-b34f-c2a40a286f12} {3788be09-5587-4e8e-bf3c-39db17025fa6} true 1350 650 3 true {eff10498-42d6-45de-91dc-e1fa69365942} {3f29afe5-fe89-4e20-bd16-5f3e79ff590c} {8c668482-c4e4-4abc-967b-4ee5bd208a2a} Exhaust_Offload {0cdfdc7c-824d-4856-8a95-dcb58bfb788b} {ecf7960d-5fe3-466a-8a57-9606bba089c5} {3558cbf5-3eba-45e1-a798-cc0a536276e3} {1fac4b7c-c303-4771-af2a-0f31da764575} {d9d404d4-3350-4450-a255-6dd24b5e0a63} {5d92703a-c8ef-4426-9082-dcaaf7d770f4} {54b7ebea-1067-4dbd-a180-6bba7a07d25b} {8cadb2fc-3fc7-4b80-ac15-3a3c571b6638} pitch 1604 {06ba7cb2-0e48-41ee-92f9-4ac02b300004} {3423f124-a0d5-4a90-8f63-26ecc588e7ed} {a8d21446-73ea-4c12-92ef-2a80d7d09bdb} pitch 879 {64073a8c-c4cd-43b6-b113-3049ab15655d} {5fbd0799-1a98-4194-91fc-6cffae88bbfa} {a8d21446-73ea-4c12-92ef-2a80d7d09bdb} pitch 1121 {5b1d9d0f-571c-4cec-9f1e-1eaab8ec81e6} {78120228-e892-4dcd-a0e6-647a8a646907} {4850e341-4861-4d8e-8590-fb9d3653b1b6} {49f0aae1-74d0-43af-83cb-b644cf665b9c} {c646dd8c-4735-4690-8a88-2ec14c53f9c0} {440f93b0-47ea-4930-915f-ee90dba53043} volume {4eef3567-e501-47b3-8d09-466ac4562db1} {649abbd1-7c3a-4230-89e0-0d9426fb6f41} {3a2fc8b2-ae1f-441b-a50e-2c8bda059201} pitch 400 {e6e0492a-6229-42c4-98c6-887bd852e57d} {d35a0a62-7c77-4dde-bfc8-15593d56a716} {cfdeb932-2637-45b5-9466-b46b8f233999} pitch 1406 {8290c304-5d92-407e-9e55-601f37725a08} {f0a6e3b3-4db1-4c5e-93fd-96288275beba} {cfdeb932-2637-45b5-9466-b46b8f233999} {63f4c3a2-367b-49b5-aab7-c8b1defa5b6d} {dd46dcba-c099-4542-9104-2c00aeb6a12b} {c77bf38f-3394-49f0-8902-0c009f42f270} pitch 945 {dd3eb169-3db4-47c1-b5e7-4568423a3d63} {ae07c3e4-4492-4753-9b77-c28f0e3e8dbf} {cda5e2a2-f513-4193-83b6-a46c77172b6c} {e3e7e6c7-1af9-45dc-8210-c8cf7208001b} {36e587b5-c5be-4dc4-9ff8-5f18db10ffe4} {78b43e7b-8172-476e-893c-8e03e16c3584} pitch 1641 {6cca5d17-ca0d-4d27-81d5-0c4c778d9792} {199a04da-682d-4ead-a722-b00bb2a96a95} {78b43e7b-8172-476e-893c-8e03e16c3584} volume {1d480c08-a136-4170-8d28-72b4688dcd8f} {ba55062d-e3f2-447e-864e-0cb29d4bc022} 0.395000011 {d9df47e1-df77-4685-8290-f3e759186372} 0 {3eae0edd-4f73-005f-09e3-f727ff075640} 2 {028d38fd-417b-0bad-290b-a30ea50da357} 1050 0 -0.254718989 1600 1 800 1 0.254718989 900 0 800 0 -0.254718989 900 1 1050 1 0.254718989 1600 0 {3e8e56fe-6058-430e-af80-ca44be8ee759} {5f92a7c0-b8b4-444c-8662-1ad09c707f83} {5be09e9c-ea32-4501-aee5-d4b3416aae84} {27917f63-d316-4f46-95a0-a271283fb8ad} {62266c93-48d0-4e8a-9205-7e964f079ad3} {093eb6a0-45ce-4473-9c36-c31bbb222473} 400 1 0.254718989 550 0 800 0 -0.254718989 1300 1 1350 1 0.254718989 1650 0 400 0 -0.254718989 550 1 800 1 0.254718989 1300 0 1350 0 -0.254718989 1650 1 {3e8e56fe-6058-430e-af80-ca44be8ee759} {152f2d42-7eec-469d-9e7a-7187749abfc8} {23226d4d-31da-43e4-bd8f-1966e207fc62} level {4ab9e2da-d86b-4c34-8a01-38b804dee18f} -1 -29.9713993 -0.81002897 1 0 250 -80 -0.131187007 400 -0.240002006 -1 0 0.323011011 1 -30 {3e8e56fe-6058-430e-af80-ca44be8ee759} {d7197947-02b2-4758-b0ea-d46ab63f62b7} {db4f7cb6-1cc1-4d64-904b-67cc0d98da00} 1 0.200000003 -1 0 0.398808002