update readme

readme.md

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+[![Release](https://jitpack.io/v/umjammer/vavi-sound-dx7.svg)](https://jitpack.io/#umjammer/vavi-sound-dx7) [![Java CI with Maven](https://github.com/umjammer/vavi-sound-dx7/workflows/Java%20CI%20with%20Maven/badge.svg)](https://github.com/umjammer/vavi-sound-dx7/actions)
+
 # vavi-sound-dx7
 
 DX7 emulated synthesizer. `javax.sound.midi.spi` compatible.
 
 ## install
 
- * maven repo: [jitpack]()
+ * maven repo: [jitpack](https://jitpack.io/#umjammer/vavi-sound-dx7)
  * copy [`unpacked.bin`](https://github.com/bwhitman/learnfm/blob/f5415157c65b0298dad692e5e332c71644718e28/unpacked.bin) into your class path
 
+## with [Herr Mueller's DX7](http://www.vstforx.de/index.php/disco-news-blog/29-goodies/92-vstforx-presents-herr-mueller-s-dx7)
+
+without the real dx7 machine, you can play dx7 sound!
+
+![herrMueller](https://lh3.googleusercontent.com/pw/ACtC-3erXg2jLuvfN_0EvFXnGhCRSRaf5D75KJZfOtmtUk8NuZGNkLOm87vipTViapFHoixBgOuMFQ4WTKMZAmfaMeU-wLlZol_udw5XMDLNDj_O9i-5Vl7U4mG-O8r0hJijXE7liyY2RjSXLVLAir0dyg2P=w640-h225-no?authuser=0)
+
 ## thanks
 
  * https://github.com/google/music-synthesizer-for-android