Video showing the drum settings for my version of the cowbell.
To be honest, it's a bit tricky and I had to get some help from synth secrets to get it kinda right.
The first Voltage Controlled Oscillator (VCO) is a triangle wave. The second VCO is also a triangle wave about 2 octaves higher and not synced.
The Voltage Controlled Filter (VCF) is of the band-pass kind.
The Envelope Generator is just a little bit of decay, meaning, the sound starts at its maximum level and then fades quickly.