FluidBufAmpSlice{
		*process { arg server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, indices, absRampUp = 10, absRampDown = 10, absThreshOn = -90, absThreshOff = -90, minSliceLength = 1, minSilenceLength = 1, minLengthAbove = 1, minLengthBelow = 1, lookBack = 0, lookAhead = 0, relRampUp = 1, relRampDown = 1, relThreshOn = 144, relThreshOff = -144, highPassFreq = 85, outputType = 0, action;

		var maxSize = max(minLengthAbove + lookBack, max(minLengthBelow,lookAhead));

		source = source.asUGenInput;
		indices = indices.asUGenInput;

		source.isNil.if {"FluidBufAmpSlice:  Invalid source buffer".throw};
		indices.isNil.if {"FluidBufAmpSlice:  Invalid features buffer".throw};

		server = server ? Server.default;

		forkIfNeeded{
			server.sendMsg(\cmd, \BufAmpSlice, source, startFrame, numFrames, startChan, numChans, indices, absRampUp, absRampDown, absThreshOn, absThreshOff, minSliceLength, minSilenceLength, minLengthAbove, minLengthBelow, lookBack, lookAhead, relRampUp, relRampDown, relThreshOn, relThreshOff, highPassFreq, maxSize, outputType);
			server.sync;
			indices = server.cachedBufferAt(indices); indices.updateInfo; server.sync;
			action.value(indices);
		};
	}
}