That is amazing! So simple, works like a treat!
All I had to do was input my vector (vrescaled) as below:
y = vco(vrescaled,[0.1 0.4]*fs,fs);
And it worked :)
I'm not sure I am quite understanding the spectrogram properly - but it looks like its on the side. Should I be plotting it in a special way? I looked at the help spectrogram page but I can't make head-nor-tail of most of it... (left is my force reading)
Thank you so much once again Greg! Not sure how/ if we are supposed to select answers as 'solved' or like them on this forum??