We are the experts at laser engraving grayscale with varied intensity as we are the ones that invented/developed it.
Our programs will only generate raster code, however they work very good with Dithered B&W logos. But, make sure the image is at least 100DPI (higher the better) because Dithering will pixelize a low resolution image.
Yes, the grayscale example in your other thread is the first we have seen with a L-Cheapo.
There is a new MultiMode grbl 1.0c that works better then the J-Tech LaserMode grbl 9g. It can be downloaded from here:https://discuss.inventables.com/t/xcarv ... 2016/28943
Make sure you backup your grbl settings before flashing the new grbl.