Task: Create a custom audio speech with uProc and send notifications

n8n workflow JSON:
{"id":"127","name":"audio","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[440,590],"parameters":{},"typeVersion":1},{"name":"Get File","type":"n8n-nodes-base.httpRequest","position":[1010,590],"parameters":{"url":"={{$node[\"Create Audio\"].json[\"message\"][\"result\"]}}","options":{},"responseFormat":"file","allowUnauthorizedCerts":true},"typeVersion":1},{"name":"Create Audio","type":"n8n-nodes-base.uproc","position":[820,590],"parameters":{"text":"={{$node[\"Create Text Item\"].json[\"text\"]}}","group":"audio","gender":"female","language":"american","additionalOptions":{}},"credentials":{"uprocApi":"miquel-uproc"},"typeVersion":1},{"name":"Create Text Item","type":"n8n-nodes-base.functionItem","position":[630,590],"parameters":{"functionCode":"item.text = \"Hi Miquel. You have two messages in your inbox\";\n\nreturn item;"},"typeVersion":1},{"name":"Upload Audio","type":"n8n-nodes-base.dropbox","position":[1190,590],"parameters":{"path":"/audios/sample_audio-mp3","binaryData":true},"credentials":{"dropboxApi":"dropbox-miquel"},"typeVersion":1},{"name":"Telegram","type":"n8n-nodes-base.telegram","position":[1370,590],"parameters":{"file":"={{$node[\"Create Audio\"].json[\"message\"][\"result\"]}}","chatId":"-1001235337538","operation":"sendAudio","additionalFields":{}},"credentials":{"telegramApi":"it-killia-bot"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Get File":{"main":[[{"node":"Upload Audio","type":"main","index":0}]]},"Create Audio":{"main":[[{"node":"Get File","type":"main","index":0}]]},"Upload Audio":{"main":[[{"node":"Telegram","type":"main","index":0}]]},"Create Text Item":{"main":[[{"node":"Create Audio","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Create Text Item","type":"main","index":0}]]}}}