private void trackBarSpeed_Scroll(object sender, System.EventArgs e) { // in Hz Bass.BASS_ChannelSetAttribute(_StreamFX, BASSAttribute.BASS_ATTRIB_TEMPO_FREQ, (float)trackBarSpeed.Value); // get the resulting ratio... float ratio = BassFx.BASS_FX_TempoGetRateRatio(_StreamFX); this.labelRatio.Text = String.Format("{0}", ratio); }