List of changes in version 2.7:
- Increased "smoothed" graph drawing precision.
- Fixed crash when 1/12 octave smoothing is enabled.
- Increased overall spectrum drawing precision.
SPAN provides you with a very flexible "mode" system which you can use to setup your spectrum analyzer preferences. You may specify Fourier block size in samples, FFT window overlap percentage, spectrum's visual slope. Beside that you can choose to display secondary spectrum of a desired type (e.g. real-time maximum, all-time maximum). Spectrum can be smoothed out visually for an easier examination.
SPAN also features output level metering with adjustable ballistics and integration time, K-system metering (including calibration K-system metering). SPAN displays level metering statistics, headroom estimation and clipping detection. Correlation metering is available as well.
SPAN features:
- Output signal power statistics
- Spectrum smoothing
- User interface window resizing
- Clipping statistics
- Correlation meter
- K-metering
- Stereo and multi-channel analysis
- Mid/side analysis
- Internal channel routing
- Channel grouping
- Preset manager
- Undo/redo history
- A/B comparisons
- Contextual hint messages
- All sample rates support
I also used to use Smartelectronix's s(M)exoscope and battled to find a replacement (64bit) with the same amount of detail. Until I came across this freebie on CM Mag called Waveshaper CM by Cableguys. I set the mix to 0% so it is only using the oscilloscope and change the view to LEFT channel only which helps increase the size of the wave form. 
