diff --git a/scenarios/scripts/p300-tactile-accumulator.lua b/scenarios/scripts/p300-tactile-accumulator.lua
index ac8240d..4f9e6a3 100644
--- a/scenarios/scripts/p300-tactile-accumulator.lua
+++ b/scenarios/scripts/p300-tactile-accumulator.lua
@@ -48,7 +48,7 @@ function initialize(box)
 	dofile(box:get_config("${Path_Data}") .. "/plugins/stimulation/lua-stimulator-stim-codes.lua")
 
 	row_base = _G[box:get_setting(2)]
-	col_base = _G[box:get_setting(3)]
+	n_tactilos = box:get_setting(3)
 	segment_start = _G[box:get_setting(4)]
 	segment_stop = _G[box:get_setting(5)]
 	
@@ -61,7 +61,6 @@ function initialize(box)
 	-- box:log("Info", string.format("pop %d %d", id[1], id[2]))
 					
 	row_votes = {}
-	col_votes = {}
 	
 	do_debug = false
 	
@@ -89,12 +88,10 @@ function process(box)
 					box:log("Info", string.format("Clear votes"))
 				end
 				-- zero the votes
-				col_votes = {}
 				row_votes = {}
 				target_fifo = List.new()
 				-- fixme fixed 20
 				for i = 0,20 do
-					col_votes[i] = 0
 					row_votes[i] = 0
 				end
 				segment_status = 1
@@ -104,18 +101,12 @@ function process(box)
 			if segment_status == 1 and identifier >= row_base and identifier <= OVTK_StimulationId_LabelEnd then
 			
 				-- assume rows before cols
-				if identifier < col_base then
+				if identifier < (row_base + n_tactilos) then
 					local t = {"row", identifier - row_base}
 					List.pushright(target_fifo,t)
 					if do_debug then	
 						box:log("Info", string.format("Push row target %d", identifier - row_base ))		
 					end
-				else
-					local t = {"col", identifier - col_base}
-					List.pushright(target_fifo,t)	
-					if do_debug then	
-						box:log("Info", string.format("Push col target %d", identifier - col_base ))		
-					end
 				end
 				
 						
@@ -145,9 +136,7 @@ function process(box)
 					box:log("Info", string.format("Pred fifo %s %d is target", t[1], t[2]))
 				end
 				if t[1]=="row" then
-					row_votes[t[2]] = row_votes[t[2]] + 1
-				else
-					col_votes[t[2]] = col_votes[t[2]] + 1				
+					row_votes[t[2]] = row_votes[t[2]] + 1			
 				end
 			end
 			
@@ -164,24 +153,18 @@ function process(box)
 			-- output the vote after the segment end when we've matched all predictions
 			
 			local maxRowIdx, maxRowValue = arrayMax(row_votes)
-			local maxColIdx, maxColValue = arrayMax(col_votes)
 
-			if maxRowValue == 0 and maxColValue == 0 then
+			if maxRowValue == 0 then
 				box:log("Warning", string.format("Classifier predicted 'no p300' for all flashes of the trial"));
 			end
 			
 			if do_debug then
 				local rowVotes = 0
-				local colVotes = 0
 				for ir, val in pairs(row_votes) do
 					rowVotes = rowVotes + val
 				end
-				for ir, val in pairs(col_votes) do
-					colVotes = colVotes + val
-				end
 			
-				box:log("Info", string.format("Vote [%d %d] wt [%d,%d]", maxRowIdx+row_base, maxColIdx+col_base, maxRowValue, maxColValue))	
-				box:log("Info", string.format("  Total [%d %d]", rowVotes, colVotes))
+				box:log("Info", string.format("Vote [%d] wt [%d]", maxRowIdx+row_base, maxRowValue))	
 			end
 			
 
@@ -189,7 +172,6 @@ function process(box)
 			local now = box:get_current_time()
 			
 			box:send_stimulation(1, maxRowIdx + row_base, now, 0)
-			box:send_stimulation(2, maxColIdx + col_base, now, 0)
 					
 			segment_status = 0
 		end