The Product Slider Extension supports the Virtuemart component from the beginning from version 1.1.x through 2.x up to 3.x.
Any VM you have installed, you don't have to do anything special, just select the Virtuemart as Slider Type.
The other option is the Theme for the Product Slider. All of the Themes are described under the Slider Themes category here.
Here you are able to setup the type specific settings. These can be different based on which of the type are you using.
Select type parameter will be set the type of the slider. Its selectable values are the following:
In this case only the featured products will be shown on the frontend, which you previously selected in the Virtuemart.
The last uploaded products will appear in the slider.
With this selection, the manufacturers will be shown in the slider.
In this option, the products ranked by the ordered number.
In this case, first the products of the selected categories are displayed. When a product selected, the category dynamically changes, depending on which category in the selected product is.
If you select this parameter, the category chooser will be enabled right under, and you will be able to select from which categories would you like to show the products.
Categories is a parameter to select from which categories would you lke to show the products.
Number of products is a parameter which you can set how many items would you like to apper in the slider.
Show out of products is a button which can set to show/hide the products that are not in stock.
Randomize parameter will be show the items in a random order.
With Show prices of the products you are able to show/hide the product prices.
Image settings parameter refers for the product images in the slider. Here you can set its dimensions, and also can choose to crop the images, or even extend them with transparent color. You can see the difference on the image below: