paste it to http://mdaines.github.io/viz.js/

mysplatoon2env.dot

digraph G {
    
    src1[label="Switch+Dock"]
    src3[label="マイク"]
    dest1[label="ディスプレイ"]
    dest2[label="ヘッドフォン"]
    mix[label="ミキサ"]
    spl[label="HDMIスプリッタ+RCA分離器"]
	src1 -> spl [label="game",color=violet]
    
    subgraph cluster_0 {
		style=filled;
		color=lightgrey;
		node [style=filled,color=white];
        cap[label="HDMIキャプチャ"]
        aml[label="録画/配信"]
		tel[label="discord VC"]
		cap -> aml [label="game",color=violet]
		tel -> aml [label="VC out",color=blue]
		label = "PC";
	}
	
	spl -> cap [label="game",color=violet]
	src3 -> tel [label="VC in",color=green]
	spl ->dest1 [label="video",color=red]
	spl -> mix [label="sound",color=blue]
	tel -> mix [label="VC out",color=blue]
	mix -> dest2 [label="mixed sound",color=blue]
	
    
    { rank=same; spl src3 }
    { rank=same; dest1 dest2 }
}

mysplatoonenv.dot

digraph G {
    
    src1[label="Wii U"]
    src2[label="ゲームパッド"]
    src3[label="マイク"]
    dest1[label="ディスプレイ"]
    dest2[label="ヘッドフォン"]
    dest3[label="Twitch"]
    dest4[label="Slack"]
    dest5[label="stat.ink"]
    mix[label="ミキサ"]
    spl[label="HDMIスプリッタ"]
	src1 -> spl [label="game",color=violet]
    
    subgraph cluster_0 {
		style=filled;
		color=lightgrey;
		node [style=filled,color=white];
        cap[label="HDMIキャプチャ"]
        aml[label="アマレコLive"]
        ikl[label="イカログ"]
		obs[label="OBS"]
		log[label="ログファイル"]
		rec[label="録画"]
		tel[label="イカデンワ"]
		
		cap -> aml [label="game",color=violet]
		aml -> ikl [label="game",color=violet]
		aml -> obs [label="game",color=violet]
	    ikl -> log [label="result"]
		aml -> rec [label="game",color=violet]
        { rank=same; log rec }
		label = "PC";
	}
	
	spl -> cap [label="game",color=violet]
	src3 -> tel [label="ikadenwa in",color=green]
	spl ->dest1 [label="game video",color=red]
	src2 -> mix [label="pad sound",color=blue]
	tel -> mix [label="ikadenwa out",color=blue]
	obs -> dest3 [label="game",color=violet,style=dashed]
	mix -> dest2 [label="mixed sound",color=blue]
	ikl -> dest4 [label="result",style=dashed]
	ikl -> dest5 [label="result",style=dashed]
	src1 -> src2 [style=dotted]
	
    
    { rank=same; src1 src2 }
    { rank=same; spl src3 }
    { rank=same; dest1 dest2 }
    { rank=same; dest3 dest4 dest5 }
    
    ポ
}