A bargraph is a audio Vu Meter or Level Meter.
NeoSoft offers NeoBookDX I bought long ago.
I also have the following plugins : ChromeAudio and tmAdvancedAudio (VST integration).
Here is a picture of mixer with Level Meters on each Track :
http://www.lazytechguys.com/wp-content/uploads/2011/02/PeakStudioMixer.pngThis is exactly what I built.
The truth is that there is nothing insurmountable. The problem is that NeoBook supports audio like a Spanish cow

You almost teach him everything and that's why I expect a development in this area...
We must realize that NeoBook is now able to manage VST technology :
https://en.wikipedia.org/wiki/Virtual_Studio_TechnologyAs a result, there are many potential customers who dream of creating a VST application within a VST Host (NeoBook). Except that, if we choose to do nothing, these millions of potential users never choose NeoBook as VST Host. The VST technology clearly opens a door and you have to fight for it never closes.
This is my feeling. I fight to make that happen as soon as possible.
I needed VST and I got it.
I needed Knob and I also received.
I work with a developer in this forum for an ASIO compatible application :
https://en.wikipedia.org/wiki/ASIO4ALLAll this to help NeoBook become an acceptable VST Host.